add missing header

1 files changed, 1 insertions, 0 deletions

diff --git a/cube-tex.c b/cube-tex.c
index c74c183..7cdc7ec 100644
--- a/cube-tex.c
+++ b/cube-tex.c
@@ -24,6 +24,7 @@
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
 
 #include "common.h"