SMPP: build the smpp interface only in case of ./configure --enable-smpp
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);
 }