--- gif_hash.h
+++ gif_hash.h
@@ -9,7 +9,6 @@
 #ifndef _GIF_HASH_H_
 #define _GIF_HASH_H_
 
-#include <unistd.h>
 #include <stdint.h>
 
 #define HT_SIZE			8192	   /* 12bits = 4096 or twice as big! */