[GPRS] Build osmo-sgsn only if libgtp is available
diff --git a/openbsc/configure.in b/openbsc/configure.in
index 66d4ee1..0f48363 100644
--- a/openbsc/configure.in
+++ b/openbsc/configure.in
@@ -17,6 +17,10 @@
dnl checks for libraries
AC_SEARCH_LIBS(crypt, crypt,
[LIBCRYPT="-lcrypt"; AC_DEFINE([VTY_CRYPT_PW], [], [Use crypt functionality of vty.])])
+AC_SEARCH_LIBS(gtp_new, gtp,
+ [LIBCRYPT="-lgtp"; AC_SUBST([GPRS_LIBGTP], [1])])
+
+AM_CONDITIONAL(HAVE_LIBGTP, test "x$GPRS_LIBGTP" != "x")
PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.1.6)
diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am
index 098961b..cebcfeb 100644
--- a/openbsc/src/gprs/Makefile.am
+++ b/openbsc/src/gprs/Makefile.am
@@ -2,7 +2,12 @@
AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS)
AM_LDFLAGS = $(LIBOSMOCORE_LIBS)
+if HAVE_LIBGTP
sbin_PROGRAMS = osmo-gbproxy osmo-sgsn
+else
+sbin_PROGRAMS = osmo-gbproxy
+endif
+
noinst_LIBRARIES = libsgsn.a
libsgsn_a_SOURCES = gprs_ns.c gprs_bssgp.c gprs_llc.c gprs_gmm.c \