diff --git a/src/bsc_hack.c b/src/bsc_hack.c
index c99159c..81ff7f0 100644
--- a/src/bsc_hack.c
+++ b/src/bsc_hack.c
@@ -428,6 +428,9 @@
 			break;
 		}
 		break;
+	case EVT_STATECHG_ADM:
+		DEBUGP(DMM, "Unhandled state change in %s:%d\n", __func__, __LINE__);
+		break;
 	}
 	return 0;
 }
diff --git a/src/e1_config.c b/src/e1_config.c
index b150e1d..0aef19d 100644
--- a/src/e1_config.c
+++ b/src/e1_config.c
@@ -4,6 +4,7 @@
 #include <openbsc/gsm_data.h>
 #include <openbsc/e1_input.h>
 #include <openbsc/trau_mux.h>
+#include <openbsc/misdn.h>
 
 #define SAPI_L2ML	0
 #define SAPI_OML	62
@@ -67,7 +68,7 @@
 	bts->trx[1].rsl_link = rsl_link;
 #endif
 
-	return mi_setup(0, line, NULL);
+	return mi_setup(0, line);
 }
 
 /* do some compiled-in configuration for our BTS/E1 setup */
diff --git a/src/e1_input.c b/src/e1_input.c
index cd23115..a319dcc 100644
--- a/src/e1_input.c
+++ b/src/e1_input.c
@@ -57,6 +57,9 @@
 /* list of all E1 lines */
 static LLIST_HEAD(line_list);
 
+/* to be implemented, e.g. by bsc_hack.c */
+void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx);
+
 #if 0
 /*
  * pcap writing of the misdn load
@@ -430,7 +433,8 @@
 		return -EINVAL;
 
 	/* FIXME: report further upwards */
-	return input_event(evt, link->type, link->trx);
+	input_event(evt, link->type, link->trx);
+	return 0;
 }
 
 /* register a driver with the E1 core */
diff --git a/src/input/ipaccess.c b/src/input/ipaccess.c
index 6c83d6d..d5291ab 100644
--- a/src/input/ipaccess.c
+++ b/src/input/ipaccess.c
@@ -56,10 +56,11 @@
 static int ipaccess_rcvmsg(struct msgb *msg, int fd)
 {
 	u_int8_t msg_type = *(msg->l2h);
+	int ret = 0;
 
 	switch (msg_type) {
 	case IPAC_MSGT_PING:
-		write(fd, pong, sizeof(pong));
+		ret = write(fd, pong, sizeof(pong));
 		break;
 	case IPAC_MSGT_PONG:
 		DEBUGP(DMI, "PONG!\n");
@@ -69,7 +70,7 @@
 		break;
 	case IPAC_MSGT_ID_ACK:
 		DEBUGP(DMI, "ID_ACK? -> ACK!\n");
-		write(fd, id_ack, sizeof(id_ack));
+		ret = write(fd, id_ack, sizeof(id_ack));
 		break;	
 	}