Index: src/kmk/kmkbuiltin/expr.c
================================================================================
--- src/kmk/kmkbuiltin/expr.c
+++ src/kmk/kmkbuiltin/expr.c
@@ -304,6 +304,8 @@
 		return v;
 	} else {
 		error();
+        /* dummy return in order to make the build checks happy (this will never be reached) */
+        return NULL;
 	}
 	/* NOTREACHED */
 }
--- src/kmk/kmkbuiltin/kbuild_protection.c
+++ src/kmk/kmkbuiltin/kbuild_protection.c
@@ -30,6 +30,7 @@
 *******************************************************************************/
 #include <sys/types.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
 #include <ctype.h>
 #include <assert.h>