diff --git a/openbsc/src/libbsc/bsc_api.c b/openbsc/src/libbsc/bsc_api.c
index 2fab20b11..86d249376 100644
--- a/openbsc/src/libbsc/bsc_api.c
+++ b/openbsc/src/libbsc/bsc_api.c
@@ -414,7 +414,7 @@ static void handle_ass_compl(struct gsm_subscriber_connection *conn,
 
 	gh = msgb_l3(msg);
 	if (msgb_l3len(msg) - sizeof(*gh) != 1) {
-		LOGP(DMSC, LOGL_ERROR, "Assignment Compl invalid: %lu\n",
+		LOGP(DMSC, LOGL_ERROR, "Assignment Compl invalid: %u\n",
 		     msgb_l3len(msg) - sizeof(*gh));
 		return;
 	}
@@ -455,7 +455,7 @@ static void handle_ass_fail(struct gsm_subscriber_connection *conn,
 
 	gh = msgb_l3(msg);
 	if (msgb_l3len(msg) - sizeof(*gh) != 1) {
-		LOGP(DMSC, LOGL_ERROR, "assignemnt failure unhandled: %lu\n",
+		LOGP(DMSC, LOGL_ERROR, "assignemnt failure unhandled: %u\n",
 		     msgb_l3len(msg) - sizeof(*gh));
 		rr_failure = NULL;
 	} else {
diff --git a/openbsc/src/libmsc/db.c b/openbsc/src/libmsc/db.c
index b57a05099..8a7ff90ca 100644
--- a/openbsc/src/libmsc/db.c
+++ b/openbsc/src/libmsc/db.c
@@ -781,7 +781,7 @@ int db_sync_subscriber(struct gsm_subscriber *subscriber)
 		subscriber->authorized,
 		q_tmsi,
 		subscriber->lac,
-		subscriber->expire_lu,
+		(int) subscriber->expire_lu,
 		subscriber->imsi);
 
 	free(q_tmsi);
diff --git a/openbsc/src/libmsc/osmo_msc.c b/openbsc/src/libmsc/osmo_msc.c
index 511d62f11..452de62d5 100644
--- a/openbsc/src/libmsc/osmo_msc.c
+++ b/openbsc/src/libmsc/osmo_msc.c
@@ -142,8 +142,6 @@ struct bsc_api *msc_bsc_api() {
 /* lchan release handling */
 void msc_release_connection(struct gsm_subscriber_connection *conn)
 {
-	struct gsm_trans *trans;
-
 	/* skip when we are in release, e.g. due an error */
 	if (conn->in_release)
 		return;
diff --git a/openbsc/src/libmsc/smpp_smsc.c b/openbsc/src/libmsc/smpp_smsc.c
index 1dc37fdd8..64ed2005f 100644
--- a/openbsc/src/libmsc/smpp_smsc.c
+++ b/openbsc/src/libmsc/smpp_smsc.c
@@ -267,18 +267,6 @@ void smpp_esme_put(struct osmo_esme *esme)
 		esme_destroy(esme);
 }
 
-static struct osmo_esme *
-esme_by_system_id(const struct smsc *smsc, char *system_id)
-{
-	struct osmo_esme *e;
-
-	llist_for_each_entry(e, &smsc->esme_list, list) {
-		if (!strcmp(e->system_id, system_id))
-			return e;
-	}
-	return NULL;
-}
-
 /*! \brief try to find a SMPP route (ESME) for given destination */
 struct osmo_esme *
 smpp_route(const struct smsc *smsc, const struct osmo_smpp_addr *dest)
@@ -845,7 +833,7 @@ dead_socket:
 }
 
 /* call-back of write queue once it wishes to write a message to the socket */
-static void esme_link_write_cb(struct osmo_fd *ofd, struct msgb *msg)
+static int esme_link_write_cb(struct osmo_fd *ofd, struct msgb *msg)
 {
 	struct osmo_esme *esme = ofd->data;
 	int rc;
@@ -858,8 +846,10 @@ static void esme_link_write_cb(struct osmo_fd *ofd, struct msgb *msg)
 		smpp_esme_put(esme);
 	} else if (rc < msgb_length(msg)) {
 		LOGP(DSMPP, LOGL_ERROR, "[%s] Short write\n", esme->system_id);
-		return;
+		return -1;
 	}
+
+	return 0;
 }
 
 /* callback for already-accepted new TCP socket */
diff --git a/openbsc/src/libmsc/smpp_smsc.h b/openbsc/src/libmsc/smpp_smsc.h
index 86fbeb5f0..747dc3a2c 100644
--- a/openbsc/src/libmsc/smpp_smsc.h
+++ b/openbsc/src/libmsc/smpp_smsc.h
@@ -124,4 +124,6 @@ int smpp_route_pfx_add(struct osmo_smpp_acl *acl,
 		       const struct osmo_smpp_addr *pfx);
 int smpp_route_pfx_del(struct osmo_smpp_acl *acl,
 		       const struct osmo_smpp_addr *pfx);
+
+int smpp_vty_init(void);
 #endif
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c b/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
index c82ffc967..72abcf427 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
@@ -337,7 +337,7 @@ static int verify_bts_loc(struct ctrl_cmd *cmd, const char *value, void *data)
 	char *saveptr, *latstr, *lonstr, *heightstr, *tstampstr, *validstr, *tmp;
 	time_t tstamp;
 	int valid;
-	double lat, lon, height;
+	double lat, lon, height __attribute__((unused));
 
 	tmp = talloc_strdup(cmd, value);
 	if (!tmp)
diff --git a/openbsc/src/utils/smpp_mirror.c b/openbsc/src/utils/smpp_mirror.c
index 213c681e6..59e341d38 100644
--- a/openbsc/src/utils/smpp_mirror.c
+++ b/openbsc/src/utils/smpp_mirror.c
@@ -10,6 +10,7 @@
 #include <smpp34_structs.h>
 #include <smpp34_params.h>
 
+#include <osmocom/core/application.h>
 #include <osmocom/core/utils.h>
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/talloc.h>