--- src/frame.c
+++ src/frame.c	2013-05-21 15:13:32.849939500 +0000
@@ -22,6 +22,9 @@ along with GNU Emacs.  If not, see <http
 #define FRAME_INLINE EXTERN_INLINE
 
 #include <stdio.h>
+#ifdef STDC_HEADERS
+#include <stdlib.h>
+#endif
 #include <errno.h>
 #include <limits.h>