diff -Naur widelands-build17-src.orig/src/main.cc widelands-build17-src/src/main.cc
--- widelands-build17-src.orig/src/main.cc	2012-04-23 11:46:49.000000000 +0200
+++ widelands-build17-src/src/main.cc	2012-11-24 19:07:53.000000000 +0100
@@ -31,6 +31,8 @@
 
 #include <SDL_main.h>
 
+#include <unistd.h>
+
 #ifndef WIN32
 #include <syslog.h>
 #include <fcntl.h>