--- flip.c
+++ flip.c
@@ -7,6 +7,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/time.h>
 #include <unistd.h>
 #include <aalib.h>
--- main.c
+++ main.c
@@ -2,6 +2,7 @@
 #include "image.h"
 #include "ui.h"
 #include "config.h"
+#include <string.h>
 
 #define NAMELEN 256