[gthumb] Include unistd.h to fix build on Mac OS, bug 573701

[Michael J. Chudobiak <mjc src gnome org>]

commit ad8eb7fc4fa4ec93e422b35d63e0f4c8c3c22827
Author: Michael J. Chudobiak <mjc avtechpulse com>
Date:   Fri May 29 08:08:13 2009 -0400

    Include unistd.h to fix build on Mac OS, bug 573701
---
 libgthumb/gfile-utils.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/libgthumb/gfile-utils.c b/libgthumb/gfile-utils.c
index 2b65f8f..195f5ce 100644
--- a/libgthumb/gfile-utils.c
+++ b/libgthumb/gfile-utils.c
@@ -23,6 +23,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
 #include <glib.h>