opt: Add missing #include <unistd.h>

1 files changed, 1 insertions, 0 deletions

diff --git a/opt.c b/opt.c
index 7d13b8d..42307a2 100644
--- a/opt.c
+++ b/opt.c
@@ -48,6 +48,7 @@
 #include <limits.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <unistd.h>
 
 static char *fake_and_arg = "-a";
 static char *fake_or_arg = "-o";