From: Julian Ospald <hasufell@gentoo.org>
Date: Fri Jun 29 08:15:12 UTC 2012
Subject: fix compilation on gcc 4.7

https://bugs.gentoo.org/show_bug.cgi?id=423965

--- a/src/nvcore/nvcore.h
+++ b/src/nvcore/nvcore.h
@@ -158,6 +158,7 @@
 #elif NV_CC_GNUC
 #	if NV_OS_LINUX
 #		include "DefsGnucLinux.h"
+#		include <unistd.h> // gcc 4.7
 #	elif NV_OS_DARWIN
 #		include "DefsGnucDarwin.h"
 #	elif NV_OS_MINGW