SMPP: build the smpp interface only in case of ./configure --enable-smpp
diff --git a/openbsc/src/libmsc/Makefile.am b/openbsc/src/libmsc/Makefile.am
index c29d521..89fee91 100644
--- a/openbsc/src/libmsc/Makefile.am
+++ b/openbsc/src/libmsc/Makefile.am
@@ -16,6 +16,8 @@
ussd.c \
vty_interface_layer3.c \
transaction.c \
- smpp_smsc.c smpp_openbsc.c \
osmo_msc.c
+if BUILD_SMPP
+libmsc_a_SOURCES += smpp_smsc.c smpp_openbsc.c
+endif
diff --git a/openbsc/src/libmsc/gsm_04_11.c b/openbsc/src/libmsc/gsm_04_11.c
index 2ed31e3..fe1b645 100644
--- a/openbsc/src/libmsc/gsm_04_11.c
+++ b/openbsc/src/libmsc/gsm_04_11.c
@@ -117,8 +117,10 @@
subscr_put(sms->sender);
if (sms->receiver)
subscr_put(sms->receiver);
+#ifdef BUILD_SMPP
if (sms->smpp.esme)
smpp_esme_put(sms->smpp.esme);
+#endif
talloc_free(sms);
}