diff --git a/ggsn/Makefile.am b/ggsn/Makefile.am
index c15f767..0aff773 100644
--- a/ggsn/Makefile.am
+++ b/ggsn/Makefile.am
@@ -1,5 +1,7 @@
 bin_PROGRAMS = ggsn
 
+AUTOMAKE_OPTIONS = subdir-objects
+
 AM_LDFLAGS = @EXEC_LDFLAGS@
 
 AM_CFLAGS = -O2 -D_GNU_SOURCE -fno-builtin -Wall -DSBINDIR='"$(sbindir)"' -ggdb
@@ -8,5 +10,6 @@
 
 #ggsn_DEPENDENCIES = ../gtp/libgtp.la
 
-ggsn_SOURCES = ggsn.c tun.c tun.h cmdline.c cmdline.h ippool.h ippool.c syserr.h syserr.c lookup.c lookup.h
+ggsn_SOURCES = ggsn.c ../lib/tun.c ../lib/tun.h cmdline.c cmdline.h ../lib/ippool.h ../lib/ippool.c ../lib/syserr.h ../lib/syserr.c ../lib/lookup.c ../lib/lookup.h
+#ggsn_SOURCES = ggsn.c cmdline.c cmdline.h