--- gencode.c
+++ gencode.c
@@ -5244,6 +5244,7 @@
 		bpf_error("invalid qualifier against IPv6 address");
 		/* NOTREACHED */
 	}
+	return NULL;
 }
 #endif /*INET6*/
 
@@ -5295,6 +5296,7 @@
 	}
 	bpf_error("ethernet address used in non-ether expression");
 	/* NOTREACHED */
+	return NULL;
 }
 
 void
@@ -5724,6 +5726,7 @@
 	}
 	bpf_error("too many registers needed to evaluate expression");
 	/* NOTREACHED */
+	return 0;
 }
 
 /*
@@ -6314,6 +6317,7 @@
 	}
 	bpf_error("ARCnet address used in non-arc expression");
 	/* NOTREACHED */
+	return NULL;
 }
 
 static struct block *