diff --git a/openbsc/Makefile.am b/openbsc/Makefile.am
index 8696eb4..f7eda56 100644
--- a/openbsc/Makefile.am
+++ b/openbsc/Makefile.am
@@ -1,7 +1,16 @@
 AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
 
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-SUBDIRS = doc include src tests
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
+
+SUBDIRS = \
+	doc \
+	include \
+	src \
+	tests \
+	$(NULL)
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = openbsc.pc
diff --git a/openbsc/doc/Makefile.am b/openbsc/doc/Makefile.am
index aee2d7b..5a23107 100644
--- a/openbsc/doc/Makefile.am
+++ b/openbsc/doc/Makefile.am
@@ -1 +1,3 @@
-SUBDIRS = examples
+SUBDIRS = \
+	examples \
+	$(NULL)
diff --git a/openbsc/doc/examples/Makefile.am b/openbsc/doc/examples/Makefile.am
index 8f14fdc..530c3fa 100644
--- a/openbsc/doc/examples/Makefile.am
+++ b/openbsc/doc/examples/Makefile.am
@@ -1,4 +1,3 @@
-
 CFG_FILES = find $(srcdir) -name '*.cfg*' | sed -e 's,^$(srcdir),,'
 
 dist-hook:
diff --git a/openbsc/include/Makefile.am b/openbsc/include/Makefile.am
index 4596b6e..3234e62 100644
--- a/openbsc/include/Makefile.am
+++ b/openbsc/include/Makefile.am
@@ -1,3 +1,8 @@
-SUBDIRS = openbsc
+SUBDIRS = \
+	openbsc \
+	$(NULL)
 
-noinst_HEADERS = mISDNif.h compat_af_isdn.h
+noinst_HEADERS = \
+	mISDNif.h \
+	compat_af_isdn.h \
+	$(NULL)
diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 90aa364..cae8ba4 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -1,25 +1,87 @@
-noinst_HEADERS = abis_nm.h abis_rsl.h db.h gsm_04_08.h gsm_data.h \
-		 gsm_subscriber.h gsm_04_11.h debug.h signal.h \
-		 misdn.h chan_alloc.h paging.h ctrl.h \
-		 trau_mux.h rs232.h openbscdefines.h rtp_proxy.h \
-		 bsc_rll.h mncc.h transaction.h ussd.h gsm_04_80.h \
-		 silent_call.h mgcp.h meas_rep.h rest_octets.h \
-		 system_information.h handover.h mgcp_internal.h \
-		 vty.h socket.h e1_config.h trau_upqueue.h token_auth.h \
-		 handover_decision.h rrlp.h \
-		crc24.h gprs_llc.h gprs_gmm.h \
-		gb_proxy.h gprs_sgsn.h sgsn.h \
-		auth.h osmo_msc.h bsc_msc.h bsc_nat.h \
-		osmo_bsc_rf.h osmo_bsc.h network_listen.h bsc_nat_sccp.h \
-		osmo_msc_data.h osmo_bsc_grace.h sms_queue.h abis_om2000.h \
-		bss.h gsm_data_shared.h ipaccess.h mncc_int.h \
-		arfcn_range_encode.h nat_rewrite_trie.h bsc_nat_callstats.h \
-		osmux.h mgcp_transcode.h gprs_utils.h \
-		 gprs_gb_parse.h smpp.h meas_feed.h \
-		 gprs_gsup_client.h bsc_msg_filter.h \
-		 oap.h oap_messages.h \
-		 gtphub.h gprs_llc_xid.h gprs_sndcp.h \
-		 iu.h
+noinst_HEADERS = \
+	abis_nm.h \
+	abis_om2000.h \
+	abis_rsl.h \
+	arfcn_range_encode.h \
+	auth.h \
+	bsc_msc.h \
+	bsc_msg_filter.h \
+	bsc_nat.h \
+	bsc_nat_callstats.h \
+	bsc_nat_sccp.h \
+	bsc_rll.h \
+	bss.h \
+	chan_alloc.h \
+	crc24.h \
+	ctrl.h \
+	db.h \
+	debug.h \
+	e1_config.h \
+	gb_proxy.h \
+	gprs_gb_parse.h \
+	gprs_gmm.h \
+	gprs_gsup_client.h \
+	gprs_llc.h \
+	gprs_llc_xid.h \
+	gprs_sgsn.h \
+	gprs_sndcp.h \
+	gprs_utils.h \
+	gsm_04_08.h \
+	gsm_04_11.h \
+	gsm_04_80.h \
+	gsm_data.h \
+	gsm_data_shared.h \
+	gsm_subscriber.h \
+	gtphub.h \
+	handover.h \
+	handover_decision.h \
+	ipaccess.h \
+	iu.h \
+	meas_feed.h \
+	meas_rep.h \
+	mgcp.h \
+	mgcp_internal.h \
+	mgcp_transcode.h \
+	misdn.h \
+	mncc.h \
+	mncc_int.h \
+	nat_rewrite_trie.h \
+	network_listen.h \
+	oap.h \
+	oap_messages.h \
+	openbscdefines.h \
+	osmo_bsc.h \
+	osmo_bsc_grace.h \
+	osmo_bsc_rf.h \
+	osmo_msc.h \
+	osmo_msc_data.h \
+	osmux.h \
+	paging.h \
+	rest_octets.h \
+	rrlp.h \
+	rs232.h \
+	rtp_proxy.h \
+	sgsn.h \
+	signal.h \
+	silent_call.h \
+	smpp.h \
+	sms_queue.h \
+	socket.h \
+	system_information.h \
+	token_auth.h \
+	transaction.h \
+	trau_mux.h \
+	trau_upqueue.h \
+	ussd.h \
+	vty.h \
+	$(NULL)
 
-openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
-openbscdir = $(includedir)/openbsc
+openbsc_HEADERS = \
+	bsc_api.h \
+	gsm_04_08.h \
+	meas_rep.h \
+	$(NULL)
+
+openbscdir = \
+	$(includedir)/openbsc \
+	$(NULL)
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 4aa880f..272292a 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -1,22 +1,59 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
+
+AM_LDFLAGS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
 # Libraries
-SUBDIRS = libcommon libmgcp libbsc libmsc libtrau libfilter
+SUBDIRS = \
+	libcommon \
+	libmgcp \
+	libbsc \
+	libmsc \
+	libtrau \
+	libfilter \
+	$(NULL)
 
 # Conditional Libraries
 if BUILD_IU
-SUBDIRS += libiu
+SUBDIRS += \
+	libiu \
+	$(NULL)
 endif
 
 # Programs
-SUBDIRS += osmo-nitb osmo-bsc_mgcp utils ipaccess gprs
+SUBDIRS += \
+	osmo-nitb \
+	osmo-bsc_mgcp \
+	utils \
+	ipaccess \
+	gprs \
+	$(NULL)
 
 # Conditional Programs
 if BUILD_NAT
-SUBDIRS += osmo-bsc_nat
+SUBDIRS += \
+	osmo-bsc_nat \
+	$(NULL)
 endif
+
 if BUILD_BSC
-SUBDIRS += osmo-bsc
+SUBDIRS += \
+	osmo-bsc \
+	$(NULL)
 endif
diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am
index 6a95315..02c8878 100644
--- a/openbsc/src/gprs/Makefile.am
+++ b/openbsc/src/gprs/Makefile.am
@@ -1,50 +1,126 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall -fno-strict-aliasing $(LIBOSMOCORE_CFLAGS) \
-	$(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOCTRL_CFLAGS) \
-	$(LIBOSMOABIS_CFLAGS) $(LIBOSMOGB_CFLAGS) $(COVERAGE_CFLAGS) \
-	$(LIBCARES_CFLAGS) $(LIBCRYPTO_CFLAGS) $(LIBGTP_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	-fno-strict-aliasing \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOGB_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBCARES_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
+	$(LIBGTP_CFLAGS) \
+	$(NULL)
 if BUILD_IU
-AM_CFLAGS += $(LIBASN1C_CFLAGS) $(LIBOSMOSIGTRAN_CFLAGS) $(LIBOSMORANAP_CFLAGS)
+AM_CFLAGS += \
+	$(LIBASN1C_CFLAGS) \
+	$(LIBOSMOSIGTRAN_CFLAGS) \
+	$(LIBOSMORANAP_CFLAGS) \
+	$(NULL)
 endif
 
-OSMO_LIBS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) \
-	    $(LIBOSMOCTRL_LIBS) $(LIBOSMOGB_LIBS)
+OSMO_LIBS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(LIBOSMOGB_LIBS) \
+	$(NULL)
 
-bin_PROGRAMS = osmo-gbproxy
-
+bin_PROGRAMS = \
+	osmo-gbproxy \
+	$(NULL)
 if HAVE_LIBGTP
 if HAVE_LIBCARES
-bin_PROGRAMS += osmo-sgsn osmo-gtphub
+bin_PROGRAMS += \
+	osmo-sgsn \
+	osmo-gtphub \
+	$(NULL)
 endif
 endif
 
-osmo_gbproxy_SOURCES =  gb_proxy.c gb_proxy_main.c gb_proxy_vty.c \
-			gb_proxy_patch.c gb_proxy_tlli.c gb_proxy_peer.c \
-			gprs_gb_parse.c gprs_llc_parse.c crc24.c gprs_utils.c
-osmo_gbproxy_LDADD = 	$(top_builddir)/src/libcommon/libcommon.a \
-			$(OSMO_LIBS) $(LIBCRYPTO_LIBS) -lrt
+osmo_gbproxy_SOURCES = \
+	gb_proxy.c \
+	gb_proxy_main.c \
+	gb_proxy_vty.c \
+	gb_proxy_patch.c \
+	gb_proxy_tlli.c \
+	gb_proxy_peer.c \
+	gprs_gb_parse.c \
+	gprs_llc_parse.c \
+	crc24.c \
+	gprs_utils.c \
+	$(NULL)
+osmo_gbproxy_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(OSMO_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-lrt \
+	$(NULL)
 
-osmo_sgsn_SOURCES =	gprs_gmm.c gprs_sgsn.c gprs_sndcp.c gprs_sndcp_vty.c \
-			sgsn_main.c sgsn_vty.c sgsn_libgtp.c \
-			gprs_llc.c gprs_llc_parse.c gprs_llc_vty.c crc24.c \
-			sgsn_ctrl.c sgsn_auth.c gprs_subscriber.c \
-			gprs_utils.c gprs_gsup_client.c \
-			sgsn_cdr.c sgsn_ares.c \
-			oap.c oap_messages.c gprs_llc_xid.c
-osmo_sgsn_LDADD = 	\
-			$(top_builddir)/src/libcommon/libcommon.a
+osmo_sgsn_SOURCES = \
+	gprs_gmm.c \
+	gprs_sgsn.c \
+	gprs_sndcp.c \
+	gprs_sndcp_vty.c \
+	sgsn_main.c \
+	sgsn_vty.c \
+	sgsn_libgtp.c \
+	gprs_llc.c \
+	gprs_llc_parse.c \
+	gprs_llc_vty.c \
+	crc24.c \
+	sgsn_ctrl.c \
+	sgsn_auth.c \
+	gprs_subscriber.c \
+	gprs_utils.c \
+	gprs_gsup_client.c \
+	sgsn_cdr.c \
+	sgsn_ares.c \
+	oap.c \
+	oap_messages.c \
+	gprs_llc_xid.c \
+	$(NULL)
+osmo_sgsn_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(OSMO_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBCARES_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-lrt \
+	-lgtp \
+	$(NULL)
 if BUILD_IU
-osmo_sgsn_LDADD +=	$(top_builddir)/src/libiu/libiu.a
-endif
-osmo_sgsn_LDADD +=	-lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS) \
-			$(LIBCRYPTO_LIBS) -lrt
-if BUILD_IU
-osmo_sgsn_LDADD +=	$(LIBOSMOSIGTRAN_LIBS) $(LIBOSMORANAP_LIBS) $(LIBASN1C_LIBS)
+osmo_sgsn_LDADD += \
+	$(top_builddir)/src/libiu/libiu.a \
+	$(LIBOSMOSIGTRAN_LIBS) \
+	$(LIBOSMORANAP_LIBS) \
+	$(LIBASN1C_LIBS) \
+	$(NULL)
 endif
 
-osmo_gtphub_SOURCES =	gtphub_main.c gtphub.c gtphub_sock.c gtphub_ares.c \
-			gtphub_vty.c sgsn_ares.c gprs_utils.c
-osmo_gtphub_LDADD = 	\
-			$(top_builddir)/src/libcommon/libcommon.a \
-			-lgtp $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) \
-			$(LIBCARES_LIBS) -lrt
+osmo_gtphub_SOURCES = \
+	gtphub_main.c \
+	gtphub.c \
+	gtphub_sock.c \
+	gtphub_ares.c \
+	gtphub_vty.c \
+	sgsn_ares.c \
+	gprs_utils.c \
+	$(NULL)
+osmo_gtphub_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBCARES_LIBS) \
+	-lrt \
+	-lgtp \
+	$(NULL)
diff --git a/openbsc/src/ipaccess/Makefile.am b/openbsc/src/ipaccess/Makefile.am
index 9acc0f7..784a578 100644
--- a/openbsc/src/ipaccess/Makefile.am
+++ b/openbsc/src/ipaccess/Makefile.am
@@ -1,26 +1,66 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS =  $(COVERAGE_LDFLAGS)
-OSMO_LIBS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOABIS_LIBS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-bin_PROGRAMS = abisip-find ipaccess-config ipaccess-proxy
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-abisip_find_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-		      $(top_builddir)/src/libtrau/libtrau.a \
-		      $(top_builddir)/src/libcommon/libcommon.a \
-		      $(OSMO_LIBS)
-abisip_find_SOURCES = abisip-find.c
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-ipaccess_config_SOURCES = ipaccess-config.c ipaccess-firmware.c network_listen.c
+OSMO_LIBS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(NULL)
+
+bin_PROGRAMS = \
+	abisip-find \
+	ipaccess-config \
+	ipaccess-proxy \
+	$(NULL)
+
+abisip_find_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(OSMO_LIBS) \
+	$(NULL)
+
+abisip_find_SOURCES = \
+	abisip-find.c \
+	$(NULL)
+
+ipaccess_config_SOURCES = \
+	ipaccess-config.c \
+	ipaccess-firmware.c \
+	network_listen.c \
+	$(NULL)
 
 # FIXME: resolve the bogus dependencies patched around here:
-ipaccess_config_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libtrau/libtrau.a \
-			$(top_builddir)/src/libcommon/libcommon.a \
-			$(LIBCRYPT) $(OSMO_LIBS)
+ipaccess_config_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBCRYPT) \
+	$(OSMO_LIBS) \
+	$(NULL)
 
-ipaccess_proxy_SOURCES = ipaccess-proxy.c
-ipaccess_proxy_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-		       $(top_builddir)/src/libtrau/libtrau.a \
-		       $(top_builddir)/src/libcommon/libcommon.a \
-		       $(OSMO_LIBS)
+ipaccess_proxy_SOURCES = \
+	ipaccess-proxy.c \
+	$(NULL)
+
+ipaccess_proxy_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(OSMO_LIBS) \
+	$(NULL)
diff --git a/openbsc/src/libbsc/Makefile.am b/openbsc/src/libbsc/Makefile.am
index fd8de0e..4728e23 100644
--- a/openbsc/src/libbsc/Makefile.am
+++ b/openbsc/src/libbsc/Makefile.am
@@ -1,28 +1,53 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) \
-	$(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_LIBRARIES = libbsc.a
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-libbsc_a_SOURCES =	abis_nm.c abis_nm_vty.c \
-			abis_om2000.c abis_om2000_vty.c \
-			abis_rsl.c bsc_rll.c \
-			paging.c \
-			bts_ericsson_rbs2000.c \
-			bts_ipaccess_nanobts.c \
-			bts_siemens_bs11.c \
-			bts_nokia_site.c \
-			bts_unknown.c \
-			bts_sysmobts.c \
-			chan_alloc.c \
-			handover_decision.c handover_logic.c meas_rep.c \
-			rest_octets.c system_information.c \
-			e1_config.c \
-			bsc_api.c bsc_msc.c bsc_vty.c \
-			gsm_04_08_utils.c \
-			bsc_init.c bts_init.c bsc_rf_ctrl.c \
-			arfcn_range_encode.c bsc_ctrl_commands.c \
-			bsc_ctrl_lookup.c \
-			net_init.c \
-			bsc_dyn_ts.c
+noinst_LIBRARIES = \
+	libbsc.a \
+	$(NULL)
+
+libbsc_a_SOURCES = \
+	abis_nm.c \
+	abis_nm_vty.c \
+	abis_om2000.c \
+	abis_om2000_vty.c \
+	abis_rsl.c \
+	bsc_rll.c \
+	paging.c \
+	bts_ericsson_rbs2000.c \
+	bts_ipaccess_nanobts.c \
+	bts_siemens_bs11.c \
+	bts_nokia_site.c \
+	bts_unknown.c \
+	bts_sysmobts.c \
+	chan_alloc.c \
+	handover_decision.c \
+	handover_logic.c \
+	meas_rep.c \
+	rest_octets.c \
+	system_information.c \
+	e1_config.c \
+	bsc_api.c \
+	bsc_msc.c bsc_vty.c \
+	gsm_04_08_utils.c \
+	bsc_init.c \
+	bts_init.c \
+	bsc_rf_ctrl.c \
+	arfcn_range_encode.c \
+	bsc_ctrl_commands.c \
+	bsc_ctrl_lookup.c \
+	net_init.c \
+	bsc_dyn_ts.c \
+	$(NULL)
 
diff --git a/openbsc/src/libcommon/Makefile.am b/openbsc/src/libcommon/Makefile.am
index 75f40ee..6cfebc2 100644
--- a/openbsc/src/libcommon/Makefile.am
+++ b/openbsc/src/libcommon/Makefile.am
@@ -1,9 +1,29 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) \
-	$(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_LIBRARIES = libcommon.a
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-libcommon_a_SOURCES = bsc_version.c common_vty.c debug.c gsm_data.c \
-		      gsm_data_shared.c socket.c talloc_ctx.c \
-		      gsm_subscriber_base.c
+noinst_LIBRARIES = \
+	libcommon.a \
+	$(NULL)
+
+libcommon_a_SOURCES = \
+	bsc_version.c \
+	common_vty.c \
+	debug.c \
+	gsm_data.c \
+	gsm_data_shared.c \
+	socket.c \
+	talloc_ctx.c \
+	gsm_subscriber_base.c \
+	$(NULL)
diff --git a/openbsc/src/libfilter/Makefile.am b/openbsc/src/libfilter/Makefile.am
index ed3cd43..6d3db0b 100644
--- a/openbsc/src/libfilter/Makefile.am
+++ b/openbsc/src/libfilter/Makefile.am
@@ -1,11 +1,26 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) \
-	$(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(COVERAGE_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_LIBRARIES = libfilter.a
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
+
+noinst_LIBRARIES = \
+	libfilter.a \
+	$(NULL)
 
 libfilter_a_SOURCES = \
 	bsc_msg_filter.c \
 	bsc_msg_acc.c \
-	bsc_msg_vty.c
+	bsc_msg_vty.c \
+	$(NULL)
 
diff --git a/openbsc/src/libiu/Makefile.am b/openbsc/src/libiu/Makefile.am
index 1968d3e..e5f9e27 100644
--- a/openbsc/src/libiu/Makefile.am
+++ b/openbsc/src/libiu/Makefile.am
@@ -1,10 +1,28 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) \
-	$(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS) $(LIBCRYPTO_CFLAGS) \
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(COVERAGE_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
 	$(LIBASN1C_CFLAGS) \
-	$(LIBOSMOSIGTRAN_CFLAGS) $(LIBOSMORANAP_CFLAGS)
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOSIGTRAN_CFLAGS) \
+	$(LIBOSMORANAP_CFLAGS) \
+	$(NULL)
 
-noinst_LIBRARIES = libiu.a
+noinst_LIBRARIES = \
+	libiu.a \
+	$(NULL)
 
-libiu_a_SOURCES = iu.c iu_vty.c
+libiu_a_SOURCES = \
+	iu.c \
+	iu_vty.c \
+	$(NULL)
 
diff --git a/openbsc/src/libmgcp/Makefile.am b/openbsc/src/libmgcp/Makefile.am
index 4403d60..5faf602 100644
--- a/openbsc/src/libmgcp/Makefile.am
+++ b/openbsc/src/libmgcp/Makefile.am
@@ -1,16 +1,43 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS = -Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) \
-	    $(LIBOSMONETIF_CFLAGS) $(COVERAGE_CFLAGS) $(LIBBCG729_CFLAGS)
-AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) \
-	     $(LIBOSMONETIF_LIBS) $(COVERAGE_LDFLAGS) $(LIBBCG729_LIBS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_LIBRARIES = libmgcp.a
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBBCG729_CFLAGS) \
+	$(NULL)
 
-noinst_HEADERS = g711common.h
+AM_LDFLAGS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMONETIF_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(LIBBCG729_LIBS) \
+	$(NULL)
 
-libmgcp_a_SOURCES = mgcp_protocol.c mgcp_network.c mgcp_vty.c mgcp_osmux.c \
-	mgcp_sdp.c
+noinst_LIBRARIES = \
+	libmgcp.a \
+	$(NULL)
 
+noinst_HEADERS = \
+	g711common.h \
+	$(NULL)
+
+libmgcp_a_SOURCES = \
+	mgcp_protocol.c \
+	mgcp_network.c \
+	mgcp_vty.c \
+	mgcp_osmux.c \
+	mgcp_sdp.c \
+	$(NULL)
 if BUILD_MGCP_TRANSCODING
-    libmgcp_a_SOURCES += mgcp_transcode.c
+libmgcp_a_SOURCES += \
+	mgcp_transcode.c \
+	$(NULL)
 endif
diff --git a/openbsc/src/libmsc/Makefile.am b/openbsc/src/libmsc/Makefile.am
index 5195890..d236d3a 100644
--- a/openbsc/src/libmsc/Makefile.am
+++ b/openbsc/src/libmsc/Makefile.am
@@ -1,27 +1,59 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) \
-	$(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS) $(LIBCRYPTO_CFLAGS) $(LIBSMPP34_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_HEADERS = meas_feed.h
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(NULL)
 
-noinst_LIBRARIES = libmsc.a
+noinst_HEADERS = \
+	meas_feed.h \
+	$(NULL)
 
-libmsc_a_SOURCES =	auth.c \
-			db.c \
-			gsm_04_08.c gsm_04_11.c gsm_04_11_helper.c \
-			gsm_04_80.c \
-			gsm_subscriber.c \
-			mncc.c mncc_builtin.c mncc_sock.c \
-			rrlp.c \
-			silent_call.c \
-			sms_queue.c \
-			token_auth.c \
-			ussd.c \
-			vty_interface_layer3.c \
-			transaction.c \
-			osmo_msc.c ctrl_commands.c meas_feed.c
+noinst_LIBRARIES = \
+	libmsc.a \
+	$(NULL)
+
+libmsc_a_SOURCES = \
+	auth.c \
+	db.c \
+	gsm_04_08.c \
+	gsm_04_11.c \
+	gsm_04_11_helper.c \
+	gsm_04_80.c \
+	gsm_subscriber.c \
+	mncc.c \
+	mncc_builtin.c \
+	mncc_sock.c \
+	rrlp.c \
+	silent_call.c \
+	sms_queue.c \
+	token_auth.c \
+	ussd.c \
+	vty_interface_layer3.c \
+	transaction.c \
+	osmo_msc.c \
+	ctrl_commands.c \
+	meas_feed.c \
+	$(NULL)
 
 if BUILD_SMPP
-noinst_HEADERS += smpp_smsc.h
-libmsc_a_SOURCES += smpp_smsc.c smpp_openbsc.c smpp_vty.c smpp_utils.c
+noinst_HEADERS += \
+	smpp_smsc.h \
+	$(NULL)
+
+libmsc_a_SOURCES += \
+	smpp_smsc.c \
+	smpp_openbsc.c \
+	smpp_vty.c \
+	smpp_utils.c \
+	$(NULL)
 endif
diff --git a/openbsc/src/libtrau/Makefile.am b/openbsc/src/libtrau/Makefile.am
index 0fe3a53..46becd6 100644
--- a/openbsc/src/libtrau/Makefile.am
+++ b/openbsc/src/libtrau/Makefile.am
@@ -1,7 +1,31 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBOSMONETIF_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOABIS_LIBS) $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_LIBRARIES = libtrau.a
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-libtrau_a_SOURCES = rtp_proxy.c trau_mux.c trau_upqueue.c
+AM_LDFLAGS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
+
+noinst_LIBRARIES = \
+	libtrau.a \
+	$(NULL)
+
+libtrau_a_SOURCES = \
+	rtp_proxy.c \
+	trau_mux.c \
+	trau_upqueue.c \
+	$(NULL)
diff --git a/openbsc/src/osmo-bsc/Makefile.am b/openbsc/src/osmo-bsc/Makefile.am
index 4aa1803..2dbfeb8 100644
--- a/openbsc/src/osmo-bsc/Makefile.am
+++ b/openbsc/src/osmo-bsc/Makefile.am
@@ -1,21 +1,55 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMONETIF_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(COVERAGE_CFLAGS) $(LIBOSMOABIS_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-bin_PROGRAMS = osmo-bsc
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(NULL)
 
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-osmo_bsc_SOURCES = osmo_bsc_main.c osmo_bsc_vty.c osmo_bsc_api.c \
-		   osmo_bsc_grace.c osmo_bsc_msc.c osmo_bsc_sccp.c \
-		   osmo_bsc_filter.c osmo_bsc_bssap.c osmo_bsc_audio.c osmo_bsc_ctrl.c
+bin_PROGRAMS = \
+	osmo-bsc \
+	$(NULL)
+
+osmo_bsc_SOURCES = \
+	osmo_bsc_main.c \
+	osmo_bsc_vty.c \
+	osmo_bsc_api.c \
+	osmo_bsc_grace.c \
+	osmo_bsc_msc.c \
+	osmo_bsc_sccp.c \
+	osmo_bsc_filter.c \
+	osmo_bsc_bssap.c \
+	osmo_bsc_audio.c \
+	osmo_bsc_ctrl.c \
+	$(NULL)
+
 # once again since TRAU uses CC symbol :(
 osmo_bsc_LDADD = \
-		 $(top_builddir)/src/libfilter/libfilter.a \
-		 $(top_builddir)/src/libbsc/libbsc.a \
-		 $(top_builddir)/src/libmsc/libmsc.a \
-		 $(top_builddir)/src/libbsc/libbsc.a \
-		 $(top_builddir)/src/libtrau/libtrau.a \
-		 $(top_builddir)/src/libcommon/libcommon.a \
-		 $(LIBOSMOSCCP_LIBS) $(LIBOSMOCORE_LIBS) \
-		 $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOCTRL_LIBS) \
-		 $(COVERAGE_LDFLAGS) $(LIBOSMOABIS_LIBS)
+	$(top_builddir)/src/libfilter/libfilter.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOSCCP_LIBS) \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(NULL)
diff --git a/openbsc/src/osmo-bsc_mgcp/Makefile.am b/openbsc/src/osmo-bsc_mgcp/Makefile.am
index a48f24b..a19a4eb 100644
--- a/openbsc/src/osmo-bsc_mgcp/Makefile.am
+++ b/openbsc/src/osmo-bsc_mgcp/Makefile.am
@@ -1,14 +1,35 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) \
-	$(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) \
-	$(LIBOSMONETIF_CFLAGS) $(COVERAGE_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-bin_PROGRAMS = osmo-bsc_mgcp
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-osmo_bsc_mgcp_SOURCES = mgcp_main.c
+bin_PROGRAMS = \
+	osmo-bsc_mgcp \
+	$(NULL)
 
-osmo_bsc_mgcp_LDADD = $(top_builddir)/src/libcommon/libcommon.a \
-		 $(top_builddir)/src/libmgcp/libmgcp.a -lrt \
-		 $(LIBOSMOVTY_LIBS) $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) \
-		 $(LIBOSMONETIF_LIBS) $(LIBBCG729_LIBS) \
-		 $(LIBRARY_GSM)
+osmo_bsc_mgcp_SOURCES = \
+	mgcp_main.c \
+	$(NULL)
+
+osmo_bsc_mgcp_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/src/libmgcp/libmgcp.a \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMONETIF_LIBS) \
+	$(LIBBCG729_LIBS) \
+	$(LIBRARY_GSM) \
+	-lrt \
+	$(NULL)
diff --git a/openbsc/src/osmo-bsc_nat/Makefile.am b/openbsc/src/osmo-bsc_nat/Makefile.am
index 4a6f74d..6027f27 100644
--- a/openbsc/src/osmo-bsc_nat/Makefile.am
+++ b/openbsc/src/osmo-bsc_nat/Makefile.am
@@ -1,19 +1,57 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBOSMONETIF_CFLAGS) $(LIBCRYPTO_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-bin_PROGRAMS = osmo-bsc_nat
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-osmo_bsc_nat_SOURCES = bsc_filter.c bsc_mgcp_utils.c bsc_nat.c bsc_nat_utils.c \
-		  bsc_nat_vty.c bsc_sccp.c bsc_ussd.c bsc_nat_ctrl.c \
-		  bsc_nat_rewrite.c bsc_nat_rewrite_trie.c bsc_nat_filter.c
+bin_PROGRAMS = \
+	osmo-bsc_nat \
+	$(NULL)
+
+osmo_bsc_nat_SOURCES = \
+	bsc_filter.c \
+	bsc_mgcp_utils.c \
+	bsc_nat.c \
+	bsc_nat_utils.c \
+	bsc_nat_vty.c \
+	bsc_sccp.c \
+	bsc_ussd.c \
+	bsc_nat_ctrl.c \
+	bsc_nat_rewrite.c \
+	bsc_nat_rewrite_trie.c \
+	bsc_nat_filter.c \
+	$(NULL)
+
 osmo_bsc_nat_LDADD = \
-		$(top_builddir)/src/libmgcp/libmgcp.a \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libtrau/libtrau.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		$(top_builddir)/src/libfilter/libfilter.a \
-		-lrt $(LIBOSMOSCCP_LIBS) $(LIBOSMOCORE_LIBS) \
-		$(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOCTRL_LIBS) \
-		$(LIBOSMOABIS_LIBS) $(LIBOSMONETIF_LIBS) $(LIBCRYPTO_LIBS)
+	$(top_builddir)/src/libmgcp/libmgcp.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/src/libfilter/libfilter.a \
+	$(LIBOSMOSCCP_LIBS) \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMONETIF_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-lrt \
+	$(NULL)
diff --git a/openbsc/src/osmo-nitb/Makefile.am b/openbsc/src/osmo-nitb/Makefile.am
index 3b7cc8d..60514c0 100644
--- a/openbsc/src/osmo-nitb/Makefile.am
+++ b/openbsc/src/osmo-nitb/Makefile.am
@@ -1,18 +1,44 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall	$(COVERAGE_CFLAGS)			\
-  	$(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) \
-	$(LIBOSMOCTRL_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBSMPP34_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CFLAGS = \
+	-Wall \
+	$(COVERAGE_CFLAGS) \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(NULL)
 
-bin_PROGRAMS = osmo-nitb
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-osmo_nitb_SOURCES = bsc_hack.c
+bin_PROGRAMS = \
+	osmo-nitb \
+	$(NULL)
+
+osmo_nitb_SOURCES = \
+	bsc_hack.c \
+	$(NULL)
+
 osmo_nitb_LDADD = \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libmsc/libmsc.a \
-		$(top_builddir)/src/libtrau/libtrau.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		-ldbi $(LIBCRYPT)				   \
-		$(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOCORE_LIBS)  \
-		$(LIBOSMOCTRL_LIBS) $(LIBOSMOABIS_LIBS) $(LIBSMPP34_LIBS) $(LIBCRYPTO_LIBS)
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBCRYPT) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBSMPP34_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-ldbi \
+	$(NULL)
diff --git a/openbsc/src/utils/Makefile.am b/openbsc/src/utils/Makefile.am
index 5a2e2d2..0dbb85c 100644
--- a/openbsc/src/utils/Makefile.am
+++ b/openbsc/src/utils/Makefile.am
@@ -1,42 +1,123 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS) $(SQLITE3_CFLAGS) \
-    $(LIBSMPP34_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
 
-noinst_HEADERS = meas_db.h
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(SQLITE3_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(NULL)
 
-bin_PROGRAMS = bs11_config isdnsync
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
+
+noinst_HEADERS = \
+	meas_db.h \
+	$(NULL)
+
+bin_PROGRAMS = \
+	bs11_config \
+	isdnsync \
+	$(NULL)
 if HAVE_SQLITE3
-bin_PROGRAMS += osmo-meas-pcap2db osmo-meas-udp2db
+bin_PROGRAMS += \
+	osmo-meas-pcap2db \
+	osmo-meas-udp2db \
+	$(NULL)
 endif
 if HAVE_LIBCDK
-bin_PROGRAMS += meas_vis
+bin_PROGRAMS += \
+	meas_vis \
+	$(NULL)
 endif
 
 if BUILD_SMPP
-noinst_PROGRAMS = smpp_mirror
+noinst_PROGRAMS = \
+	smpp_mirror \
+	$(NULL)
 endif
 
-bs11_config_SOURCES = bs11_config.c
-bs11_config_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-		    $(top_builddir)/src/libtrau/libtrau.a \
-		    $(top_builddir)/src/libcommon/libcommon.a \
-		    $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOABIS_LIBS)
+bs11_config_SOURCES = \
+	bs11_config.c \
+	$(NULL)
 
-isdnsync_SOURCES = isdnsync.c
+bs11_config_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(NULL)
 
-smpp_mirror_SOURCES = smpp_mirror.c
-smpp_mirror_LDADD = $(top_builddir)/src/libcommon/libcommon.a \
-		    $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS)
+isdnsync_SOURCES = \
+	isdnsync.c \
+	$(NULL)
 
-meas_vis_SOURCES = meas_vis.c
-meas_vis_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) -lcdk -lncurses
-meas_vis_CFLAGS = $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS)
+smpp_mirror_SOURCES = \
+	smpp_mirror.c \
+	$(NULL)
 
-osmo_meas_pcap2db_SOURCES = meas_pcap2db.c meas_db.c
-osmo_meas_pcap2db_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) -lpcap $(SQLITE3_LIBS)
-osmo_meas_pcap2db_CFLAGS = $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS)
+smpp_mirror_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBSMPP34_LIBS) \
+	$(NULL)
 
-osmo_meas_udp2db_SOURCES = meas_udp2db.c meas_db.c
-osmo_meas_udp2db_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(SQLITE3_LIBS)
-osmo_meas_udp2db_CFLAGS = $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS)
+meas_vis_SOURCES = \
+	meas_vis.c \
+	$(NULL)
+
+meas_vis_LDADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	-lcdk \
+	-lncurses \
+	$(NULL)
+
+meas_vis_CFLAGS = \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
+
+osmo_meas_pcap2db_SOURCES = \
+	meas_pcap2db.c \
+	meas_db.c \
+	$(NULL)
+
+osmo_meas_pcap2db_LDADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(SQLITE3_LIBS) \
+	-lpcap \
+	$(NULL)
+
+osmo_meas_pcap2db_CFLAGS = \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
+
+osmo_meas_udp2db_SOURCES = \
+	meas_udp2db.c \
+	meas_db.c \
+	$(NULL)
+
+osmo_meas_udp2db_LDADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(SQLITE3_LIBS) \
+	$(NULL)
+
+osmo_meas_udp2db_CFLAGS = \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
diff --git a/openbsc/tests/Makefile.am b/openbsc/tests/Makefile.am
index ba5ca28..7396c52 100644
--- a/openbsc/tests/Makefile.am
+++ b/openbsc/tests/Makefile.am
@@ -1,24 +1,44 @@
-SUBDIRS = gsm0408 db channel mgcp gprs abis gbproxy trau subscr mm_auth xid
-
+SUBDIRS = \
+	gsm0408 \
+	db \
+	channel \
+	mgcp \
+	gprs \
+	abis \
+	gbproxy \
+	trau \
+	subscr \
+	mm_auth \
+	xid \
+	$(NULL)
 if BUILD_NAT
-SUBDIRS += bsc-nat bsc-nat-trie
+SUBDIRS += \
+	bsc-nat \
+	bsc-nat-trie \
+	$(NULL)
 endif
-
 if BUILD_BSC
-SUBDIRS += bsc
+SUBDIRS += \
+	bsc \
+	$(NULL)
 endif
-
 if BUILD_SMPP
-SUBDIRS += smpp
+SUBDIRS += \
+	smpp \
+	$(NULL)
 endif
-
 if HAVE_LIBGTP
-SUBDIRS += gtphub
-if HAVE_LIBCARES
-SUBDIRS += sgsn oap
-endif
-endif
+SUBDIRS += \
+	gtphub \
+	$(NULL)
 
+if HAVE_LIBCARES
+SUBDIRS += \
+	sgsn \
+	oap \
+	$(NULL)
+endif
+endif
 
 # The `:;' works around a Bash 3.2 bug when the output is not writeable.
 $(srcdir)/package.m4: $(top_srcdir)/configure.ac
@@ -38,9 +58,20 @@
                echo '  [$(PACKAGE_URL)])'; \
              } >'$(srcdir)/package.m4'
 
-EXTRA_DIST = testsuite.at $(srcdir)/package.m4 $(TESTSUITE) vty_test_runner.py ctrl_test_runner.py smpp_test_runner.py
+EXTRA_DIST = \
+	testsuite.at \
+	$(srcdir)/package.m4 \
+	$(TESTSUITE) \
+	vty_test_runner.py \
+	ctrl_test_runner.py \
+	smpp_test_runner.py \
+	$(NULL)
+
 TESTSUITE = $(srcdir)/testsuite
-DISTCLEANFILES = atconfig
+
+DISTCLEANFILES = \
+	atconfig \
+	$(NULL)
 
 if ENABLE_EXT_TESTS
 python-tests: $(BUILT_SOURCES)
diff --git a/openbsc/tests/abis/Makefile.am b/openbsc/tests/abis/Makefile.am
index c2e38de..cbc3e07 100644
--- a/openbsc/tests/abis/Makefile.am
+++ b/openbsc/tests/abis/Makefile.am
@@ -1,17 +1,35 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOABIS_CFLAGS) \
-	$(LIBOSMOGSM_CFLAGS) $(COVERAGE_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = abis_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = abis_test
+EXTRA_DIST = \
+	abis_test.ok \
+	$(NULL)
 
-abis_test_SOURCES = abis_test.c
+noinst_PROGRAMS = \
+	abis_test \
+	$(NULL)
+
+abis_test_SOURCES = \
+	abis_test.c \
+	$(NULL)
 
 abis_test_LDADD = \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libtrau/libtrau.a \
-		$(LIBOSMOCORE_LIBS) $(LIBOSMOABIS_LIBS) \
-		$(LIBOSMOGSM_LIBS)
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)
diff --git a/openbsc/tests/bsc-nat/Makefile.am b/openbsc/tests/bsc-nat/Makefile.am
index 26e5500..fa55d27 100644
--- a/openbsc/tests/bsc-nat/Makefile.am
+++ b/openbsc/tests/bsc-nat/Makefile.am
@@ -1,26 +1,58 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOCTRL_LIBS) $(LIBOSMOSCCP_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBOSMONETIF_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = bsc_nat_test.ok bsc_data.c barr.cfg barr_dup.cfg prefixes.csv
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = bsc_nat_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-bsc_nat_test_SOURCES = bsc_nat_test.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_filter.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_sccp.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_utils.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_mgcp_utils.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_filter.c
+EXTRA_DIST = \
+	bsc_nat_test.ok \
+	bsc_data.c \
+	barr.cfg \
+	barr_dup.cfg \
+	prefixes.csv \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	bsc_nat_test \
+	$(NULL)
+
+bsc_nat_test_SOURCES = \
+	bsc_nat_test.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_filter.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_sccp.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_utils.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_mgcp_utils.c \
+	$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_filter.c
+
 bsc_nat_test_LDADD = \
-			$(top_builddir)/src/libfilter/libfilter.a \
-			$(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libmgcp/libmgcp.a \
-			$(top_builddir)/src/libtrau/libtrau.a \
-			$(top_builddir)/src/libcommon/libcommon.a \
-			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) -lrt \
-			$(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
-			$(LIBOSMOABIS_LIBS) $(LIBOSMONETIF_LIBS) \
-			$(LIBOSMOCTRL_LIBS)
+	$(top_builddir)/src/libfilter/libfilter.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmgcp/libmgcp.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOSCCP_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMONETIF_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	-lrt \
+	$(NULL)
diff --git a/openbsc/tests/bsc/Makefile.am b/openbsc/tests/bsc/Makefile.am
index 8b786ff..ddfa437 100644
--- a/openbsc/tests/bsc/Makefile.am
+++ b/openbsc/tests/bsc/Makefile.am
@@ -1,18 +1,45 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = bsc_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = bsc_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-bsc_test_SOURCES = bsc_test.c \
-			$(top_srcdir)/src/osmo-bsc/osmo_bsc_filter.c
-bsc_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libmsc/libmsc.a \
-			$(top_builddir)/src/libmgcp/libmgcp.a \
-			$(top_builddir)/src/libtrau/libtrau.a \
-			$(top_builddir)/src/libcommon/libcommon.a \
-			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) -lrt \
-			$(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
-			$(LIBOSMOABIS_LIBS)
+EXTRA_DIST = \
+	bsc_test.ok \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	bsc_test \
+	$(NULL)
+
+bsc_test_SOURCES = \
+	bsc_test.c \
+	$(top_srcdir)/src/osmo-bsc/osmo_bsc_filter.c \
+	$(NULL)
+
+bsc_test_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libmgcp/libmgcp.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOSCCP_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	-lrt \
+	$(NULL)
diff --git a/openbsc/tests/channel/Makefile.am b/openbsc/tests/channel/Makefile.am
index 51b2f83..5654572 100644
--- a/openbsc/tests/channel/Makefile.am
+++ b/openbsc/tests/channel/Makefile.am
@@ -1,14 +1,34 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = channel_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = channel_test
+EXTRA_DIST = \
+	channel_test.ok \
+	$(NULL)
 
-channel_test_SOURCES = channel_test.c
+noinst_PROGRAMS = \
+	channel_test \
+	$(NULL)
+
+channel_test_SOURCES = \
+	channel_test.c \
+	$(NULL)
+
 channel_test_LDADD = \
 	$(top_builddir)/src/libbsc/libbsc.a \
 	$(top_builddir)/src/libmsc/libmsc.a \
 	$(top_builddir)/src/libcommon/libcommon.a \
 	$(LIBOSMOCORE_LIBS) \
-	-ldbi $(LIBOSMOGSM_LIBS) $(LIBCRYPTO_LIBS)
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-ldbi \
+	$(NULL)
diff --git a/openbsc/tests/db/Makefile.am b/openbsc/tests/db/Makefile.am
index be3af5f..c4da31c 100644
--- a/openbsc/tests/db/Makefile.am
+++ b/openbsc/tests/db/Makefile.am
@@ -1,17 +1,48 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBSMPP34_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = db_test.ok db_test.err hlr.sqlite3
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = db_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-db_test_SOURCES = db_test.c
-db_test_LDADD =	$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libmsc/libmsc.a \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libtrau/libtrau.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		$(LIBOSMOCORE_LIBS) $(LIBOSMOABIS_LIBS) \
-		$(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS) $(LIBOSMOVTY_LIBS) $(LIBCRYPTO_LIBS) -ldbi
+EXTRA_DIST = \
+	db_test.ok \
+	db_test.err \
+	hlr.sqlite3 \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	db_test \
+	$(NULL)
+
+db_test_SOURCES = \
+	db_test.c \
+	$(NULL)
+
+db_test_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBSMPP34_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-ldbi \
+	$(NULL)
 
diff --git a/openbsc/tests/gbproxy/Makefile.am b/openbsc/tests/gbproxy/Makefile.am
index 18d77a8..2dd66df 100644
--- a/openbsc/tests/gbproxy/Makefile.am
+++ b/openbsc/tests/gbproxy/Makefile.am
@@ -1,27 +1,54 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = gbproxy_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = gbproxy_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-gbproxy_test_SOURCES = gbproxy_test.c
+EXTRA_DIST = \
+	gbproxy_test.ok \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	gbproxy_test \
+	$(NULL)
+
+gbproxy_test_SOURCES = \
+	gbproxy_test.c \
+	$(NULL)
+
 gbproxy_test_LDFLAGS = \
-	     -Wl,--wrap=RAND_bytes
+	-Wl,--wrap=RAND_bytes \
+	$(NULL)
+
 gbproxy_test_LDADD = \
-			$(top_builddir)/src/gprs/gb_proxy.o \
-			$(top_builddir)/src/gprs/gb_proxy_patch.o \
-			$(top_builddir)/src/gprs/gb_proxy_peer.o \
-			$(top_builddir)/src/gprs/gb_proxy_tlli.o \
-			$(top_builddir)/src/gprs/gprs_gb_parse.o \
-			$(top_builddir)/src/gprs/gprs_llc_parse.o \
-			$(top_builddir)/src/gprs/crc24.o \
-			$(top_builddir)/src/gprs/gprs_utils.o \
-			$(top_builddir)/src/libcommon/libcommon.a \
-			$(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libtrau/libtrau.a \
-			$(LIBOSMOCORE_LIBS) $(LIBOSMOGB_LIBS) \
-			$(LIBOSMOGSM_LIBS)  $(LIBOSMOVTY_LIBS) \
-			$(LIBOSMOABIS_LIBS) $(LIBRARY_DL) \
-			$(LIBCRYPTO_LIBS) -lrt
+	$(top_builddir)/src/gprs/gb_proxy.o \
+	$(top_builddir)/src/gprs/gb_proxy_patch.o \
+	$(top_builddir)/src/gprs/gb_proxy_peer.o \
+	$(top_builddir)/src/gprs/gb_proxy_tlli.o \
+	$(top_builddir)/src/gprs/gprs_gb_parse.o \
+	$(top_builddir)/src/gprs/gprs_llc_parse.o \
+	$(top_builddir)/src/gprs/crc24.o \
+	$(top_builddir)/src/gprs/gprs_utils.o \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGB_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBRARY_DL) \
+	$(LIBCRYPTO_LIBS) \
+	-lrt \
+	$(NULL)
diff --git a/openbsc/tests/gsm0408/Makefile.am b/openbsc/tests/gsm0408/Makefile.am
index 79fb9f1..11fa6b9 100644
--- a/openbsc/tests/gsm0408/Makefile.am
+++ b/openbsc/tests/gsm0408/Makefile.am
@@ -1,12 +1,34 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS)
-noinst_PROGRAMS = gsm0408_test
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = gsm0408_test.ok
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(NULL)
 
-gsm0408_test_SOURCES = gsm0408_test.c
-gsm0408_test_LDADD =	$(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libmsc/libmsc.a \
-			$(top_builddir)/src/libtrau/libtrau.a \
-			$(top_builddir)/src/libcommon/libcommon.a \
-			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOABIS_LIBS) -ldbi
+noinst_PROGRAMS = \
+	gsm0408_test \
+	$(NULL)
+
+EXTRA_DIST = \
+	gsm0408_test.ok \
+	$(NULL)
+
+gsm0408_test_SOURCES = \
+	gsm0408_test.c \
+	$(NULL)
+
+gsm0408_test_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	-ldbi \
+	$(NULL)
diff --git a/openbsc/tests/gtphub/Makefile.am b/openbsc/tests/gtphub/Makefile.am
index dcb7211..137924d 100644
--- a/openbsc/tests/gtphub/Makefile.am
+++ b/openbsc/tests/gtphub/Makefile.am
@@ -1,24 +1,40 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(NULL)
 
 EXTRA_DIST = \
-	gtphub_test.ok
+	gtphub_test.ok \
+	$(NULL)
 
 if HAVE_LIBGTP
 if HAVE_LIBCARES
-noinst_PROGRAMS = gtphub_test
+noinst_PROGRAMS = \
+	gtphub_test \
+	$(NULL)
 endif
 endif
 
-gtphub_test_SOURCES = gtphub_test.c
+gtphub_test_SOURCES = \
+	gtphub_test.c \
+	$(NULL)
+
 gtphub_test_LDFLAGS = \
 	-Wl,--wrap=gtphub_resolve_ggsn_addr \
 	-Wl,--wrap=gtphub_ares_init \
-	-Wl,--wrap=gtphub_write
+	-Wl,--wrap=gtphub_write \
+	$(NULL)
 
 gtphub_test_LDADD = \
 	$(top_builddir)/src/gprs/gtphub.o \
 	$(top_builddir)/src/gprs/gprs_utils.o \
 	$(LIBOSMOCORE_LIBS) \
-	-lgtp -lrt
-
+	-lgtp \
+	-lrt \
+	$(NULL)
diff --git a/openbsc/tests/mgcp/Makefile.am b/openbsc/tests/mgcp/Makefile.am
index 82d6ac6..4b18036 100644
--- a/openbsc/tests/mgcp/Makefile.am
+++ b/openbsc/tests/mgcp/Makefile.am
@@ -1,30 +1,72 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_srcdir)
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_FLAGS) $(LIBOSMONETIF_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(COVERAGE_CFLAGS) $(LIBBCG729_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir) \
+	$(NULL)
 
-EXTRA_DIST = mgcp_test.ok mgcp_transcoding_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_FLAGS) \
+	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBBCG729_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = mgcp_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
+EXTRA_DIST = \
+	mgcp_test.ok \
+	mgcp_transcoding_test.ok \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	mgcp_test \
+	$(NULL)
 if BUILD_MGCP_TRANSCODING
-noinst_PROGRAMS += mgcp_transcoding_test
+noinst_PROGRAMS += \
+	mgcp_transcoding_test \
+	$(NULL)
 endif
 
-mgcp_test_SOURCES = mgcp_test.c
+mgcp_test_SOURCES = \
+	mgcp_test.c \
+	$(NULL)
 
-mgcp_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libmgcp/libmgcp.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) \
-		-lrt -lm $(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
-		$(LIBRARY_DL) $(LIBOSMONETIF_LIBS)
+mgcp_test_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmgcp/libmgcp.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOSCCP_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBRARY_DL) \
+	$(LIBOSMONETIF_LIBS) \
+	-lrt \
+	-lm  \
+	$(NULL)
 
-mgcp_transcoding_test_SOURCES = mgcp_transcoding_test.c
+mgcp_transcoding_test_SOURCES = \
+	mgcp_transcoding_test.c \
+	$(NULL)
 
 mgcp_transcoding_test_LDADD = \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libmgcp/libmgcp.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) \
-		$(LIBBCG729_LIBS) -lrt -lm $(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
-		$(LIBRARY_DL) $(LIBOSMONETIF_LIBS) $(LIBRARY_GSM)
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmgcp/libmgcp.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBBCG729_LIBS) \
+	$(LIBOSMOSCCP_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBRARY_DL) \
+	$(LIBOSMONETIF_LIBS) \
+	$(LIBRARY_GSM) \
+	-lrt \
+	-lm \
+	$(NULL)
diff --git a/openbsc/tests/mm_auth/Makefile.am b/openbsc/tests/mm_auth/Makefile.am
index 516df00..7eb14fa 100644
--- a/openbsc/tests/mm_auth/Makefile.am
+++ b/openbsc/tests/mm_auth/Makefile.am
@@ -1,21 +1,36 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall \
-	  $(LIBOSMOCORE_CFLAGS) \
-	  $(LIBOSMOGSM_CFLAGS) \
-	  $(LIBCRYPTO_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-noinst_PROGRAMS = mm_auth_test
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
+	$(NULL)
 
-EXTRA_DIST = mm_auth_test.ok
+noinst_PROGRAMS = \
+	mm_auth_test \
+	$(NULL)
 
-mm_auth_test_SOURCES = mm_auth_test.c
+EXTRA_DIST = \
+	mm_auth_test.ok \
+	$(NULL)
+
+mm_auth_test_SOURCES = \
+	mm_auth_test.c \
+	$(NULL)
 
 mm_auth_test_LDFLAGS = \
 	-Wl,--wrap=db_get_authinfo_for_subscr \
 	-Wl,--wrap=db_get_lastauthtuple_for_subscr \
-	-Wl,--wrap=db_sync_lastauthtuple_for_subscr
+	-Wl,--wrap=db_sync_lastauthtuple_for_subscr \
+	$(NULL)
 
-mm_auth_test_LDADD = $(top_builddir)/src/libmsc/libmsc.a \
-		     $(top_builddir)/src/libcommon/libcommon.a \
-		     $(LIBOSMOCORE_LIBS) \
-		     $(LIBOSMOGSM_LIBS)
+mm_auth_test_LDADD = \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)
diff --git a/openbsc/tests/oap/Makefile.am b/openbsc/tests/oap/Makefile.am
index 538e178..06ccf33 100644
--- a/openbsc/tests/oap/Makefile.am
+++ b/openbsc/tests/oap/Makefile.am
@@ -1,15 +1,30 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = oap_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
+
+EXTRA_DIST = \
+	oap_test.ok \
+	$(NULL)
 
 if HAVE_LIBGTP
 if HAVE_LIBCARES
-noinst_PROGRAMS = oap_test
+noinst_PROGRAMS = \
+	oap_test \
+	$(NULL)
 endif
 endif
 
-oap_test_SOURCES = oap_test.c
+oap_test_SOURCES = \
+	oap_test.c \
+	$(NULL)
 
 oap_test_LDADD = \
 	$(top_builddir)/src/gprs/oap.o \
diff --git a/openbsc/tests/sgsn/Makefile.am b/openbsc/tests/sgsn/Makefile.am
index ce64429..6371707 100644
--- a/openbsc/tests/sgsn/Makefile.am
+++ b/openbsc/tests/sgsn/Makefile.am
@@ -1,20 +1,42 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBCARES_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBCARES_CFLAGS) \
+	$(NULL)
 if BUILD_IU
-AM_CFLAGS += $(LIBASN1C_CFLAGS) $(LIBOSMOSIGTRAN_CFLAGS) $(LIBOSMORANAP_CFLAGS)
+AM_CFLAGS += \
+	$(LIBASN1C_CFLAGS) \
+	$(LIBOSMOSIGTRAN_CFLAGS) \
+	$(LIBOSMORANAP_CFLAGS) \
+	$(NULL)
 endif
 
-EXTRA_DIST = sgsn_test.ok
+EXTRA_DIST = \
+	sgsn_test.ok \
+	$(NULL)
 
-noinst_PROGRAMS = sgsn_test
+noinst_PROGRAMS = \
+	sgsn_test \
+	$(NULL)
 
-sgsn_test_SOURCES = sgsn_test.c
+sgsn_test_SOURCES = \
+	sgsn_test.c \
+	$(NULL)
+
 sgsn_test_LDFLAGS = \
 	-Wl,--wrap=RAND_bytes \
 	-Wl,--wrap=sgsn_update_subscriber_data \
 	-Wl,--wrap=gprs_subscr_request_update_location \
 	-Wl,--wrap=gprs_subscr_request_auth_info \
-	-Wl,--wrap=gprs_gsup_client_send
+	-Wl,--wrap=gprs_gsup_client_send \
+	$(NULL)
 
 sgsn_test_LDADD = \
 	$(top_builddir)/src/gprs/gprs_llc_parse.o \
@@ -33,7 +55,7 @@
 	$(top_builddir)/src/gprs/gprs_gb_parse.o \
 	$(top_builddir)/src/gprs/oap.o \
 	$(top_builddir)/src/gprs/oap_messages.o \
-        $(top_builddir)/src/gprs/gprs_llc_xid.o \
+	$(top_builddir)/src/gprs/gprs_llc_xid.o \
 	$(top_builddir)/src/libcommon/libcommon.a \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOCORE_LIBS) \
@@ -41,12 +63,14 @@
 	$(LIBOSMOGB_LIBS) \
 	$(LIBCARES_LIBS) \
 	$(LIBCRYPTO_LIBS) \
-	-lgtp -lrt
+	-lgtp \
+	-lrt \
+	$(NULL)
 if BUILD_IU
 sgsn_test_LDADD += \
 	$(top_builddir)/src/libiu/libiu.a \
 	$(LIBOSMORANAP_LIBS) \
 	$(LIBOSMOSIGTRAN_LIBS) \
-	$(LIBASN1C_LIBS)
+	$(LIBASN1C_LIBS) \
+	$(NULL)
 endif
-
diff --git a/openbsc/tests/smpp/Makefile.am b/openbsc/tests/smpp/Makefile.am
index aab4de9..5082707 100644
--- a/openbsc/tests/smpp/Makefile.am
+++ b/openbsc/tests/smpp/Makefile.am
@@ -1,13 +1,40 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_srcdir)/src/libmsc
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS) $(LIBSMPP34_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/src/libmsc \
+	$(NULL)
 
-EXTRA_DIST = smpp_test.ok smpp_test.err
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOSCCP_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = smpp_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-smpp_test_SOURCES = smpp_test.c \
-	$(top_builddir)/src/libmsc/smpp_utils.c
+EXTRA_DIST = \
+	smpp_test.ok \
+	smpp_test.err \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	smpp_test \
+	$(NULL)
+
+smpp_test_SOURCES = \
+	smpp_test.c \
+	$(top_builddir)/src/libmsc/smpp_utils.c \
+	$(NULL)
+
 smpp_test_LDADD = \
 	$(top_builddir)/src/libcommon/libcommon.a \
-	$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)
diff --git a/openbsc/tests/subscr/Makefile.am b/openbsc/tests/subscr/Makefile.am
index 4f96dc9..fb863d8 100644
--- a/openbsc/tests/subscr/Makefile.am
+++ b/openbsc/tests/subscr/Makefile.am
@@ -1,18 +1,43 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBSMPP34_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = subscr_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = subscr_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-subscr_test_SOURCES = subscr_test.c
-subscr_test_LDADD   =	$(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libmsc/libmsc.a \
-			$(top_builddir)/src/libbsc/libbsc.a \
-			$(top_builddir)/src/libtrau/libtrau.a \
-			$(top_builddir)/src/libcommon/libcommon.a \
-			$(LIBOSMOCORE_LIBS) $(LIBOSMOABIS_LIBS) \
-			$(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS) $(LIBOSMOVTY_LIBS)
-# -ldbi
+EXTRA_DIST = \
+	subscr_test.ok \
+	$(NULL)
 
+noinst_PROGRAMS = \
+	subscr_test \
+	$(NULL)
+
+subscr_test_SOURCES = \
+	subscr_test.c \
+	$(NULL)
+
+subscr_test_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBSMPP34_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(NULL)
diff --git a/openbsc/tests/trau/Makefile.am b/openbsc/tests/trau/Makefile.am
index cc1b4ef..93ce88e 100644
--- a/openbsc/tests/trau/Makefile.am
+++ b/openbsc/tests/trau/Makefile.am
@@ -1,17 +1,46 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(LIBSMPP34_CFLAGS) $(COVERAGE_CFLAGS)
-AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = trau_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBSMPP34_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = trau_test
+AM_LDFLAGS = \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
 
-trau_test_SOURCES = trau_test.c
-trau_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libmsc/libmsc.a \
-		$(top_builddir)/src/libbsc/libbsc.a \
-		$(top_builddir)/src/libtrau/libtrau.a \
-		$(top_builddir)/src/libcommon/libcommon.a \
-		$(LIBOSMOCORE_LIBS) $(LIBOSMOABIS_LIBS) \
-		$(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS) $(LIBOSMOVTY_LIBS) $(LIBRARY_DL) -ldbi
+EXTRA_DIST = \
+	trau_test.ok \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	trau_test \
+	$(NULL)
+
+trau_test_SOURCES = \
+	trau_test.c \
+	$(NULL)
+
+trau_test_LDADD = \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libbsc/libbsc.a \
+	$(top_builddir)/src/libtrau/libtrau.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBSMPP34_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBRARY_DL) \
+	-ldbi \
+	$(NULL)
 
diff --git a/openbsc/tests/xid/Makefile.am b/openbsc/tests/xid/Makefile.am
index 9b64965..e7c4cf0 100644
--- a/openbsc/tests/xid/Makefile.am
+++ b/openbsc/tests/xid/Makefile.am
@@ -1,11 +1,27 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBCARES_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-EXTRA_DIST = xid_test.ok
+AM_CFLAGS = \
+	-Wall \
+	-ggdb3 \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBCARES_CFLAGS) \
+	$(NULL)
 
-noinst_PROGRAMS = xid_test
+EXTRA_DIST = \
+	xid_test.ok \
+	$(NULL)
 
-xid_test_SOURCES = xid_test.c
+noinst_PROGRAMS = \
+	xid_test \
+	$(NULL)
+
+xid_test_SOURCES = \
+	xid_test.c \
+	$(NULL)
 
 xid_test_LDADD = \
 	$(top_builddir)/src/gprs/gprs_llc_xid.o \
@@ -16,6 +32,8 @@
 	$(LIBOSMOGB_LIBS) \
 	$(LIBCARES_LIBS) \
 	$(LIBCRYPTO_LIBS) \
-	-lgtp -lrt -lm
-
+	-lgtp \
+	-lrt \
+	-lm \
+	$(NULL)