$OpenBSD: patch-CMakeLists_txt,v 1.6 2013/07/09 10:03:47 jasper Exp $

Don't clobber CFLAGS.
-Wextra is not available with gcc < 4.

--- CMakeLists.txt.orig	Tue Jun 25 00:14:45 2013
+++ CMakeLists.txt	Tue Jul  9 11:47:58 2013
@@ -233,7 +233,7 @@ IF (MSVC)
    # Precompiled headers
 
 ELSE ()
-	SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra -Wno-missing-field-initializers -Wstrict-aliasing=2 -Wstrict-prototypes ${CMAKE_C_FLAGS}")
+	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_GNU_SOURCE -Wall -Wno-missing-field-initializers -Wstrict-aliasing=2 -Wstrict-prototypes ${CMAKE_C_FLAGS}")
 
 	IF (WIN32 AND NOT CYGWIN)
 		SET(CMAKE_C_FLAGS_DEBUG "-D_DEBUG")
