Honor CFLAGS and don't use -Wextra (not available on gcc < 4); ok jasper@

devel/libgit2/libgit2/Makefile

@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.2 2011/08/25 07:11:20 jasper Exp $
+# $OpenBSD: Makefile,v 1.3 2011/08/28 16:59:22 naddy Exp $
 
 COMMENT=		the Git library, take 2
 
 DISTNAME=		libgit2-0.14.0
+REVISION=		0
 SHARED_LIBS +=  git2                      1.0 # 0.14
 
 MODULES=		devel/cmake

devel/libgit2/libgit2/patches/patch-CMakeLists_txt

@@ -0,0 +1,21 @@
+$OpenBSD: patch-CMakeLists_txt,v 1.3 2011/08/28 16:59:22 naddy Exp $
+
+Don't clobber CFLAGS.
+-Wextra is not available with gcc < 4.
+
+--- CMakeLists.txt.orig	Thu Jul 14 03:26:08 2011
++++ CMakeLists.txt	Sun Aug 28 18:43:17 2011
+@@ -53,12 +53,10 @@ IF (MSVC)
+ 	SET(CMAKE_C_FLAGS_DEBUG "/Od /DEBUG /MTd")
+ 	SET(CMAKE_C_FLAGS_RELEASE "/MT /O2")
+ ELSE ()
+-	SET(CMAKE_C_FLAGS "-Wall -Wextra")
++	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
+ 	IF (NOT MINGW) # MinGW always does PIC and complains if we tell it to
+ 		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+ 	ENDIF ()
+-	SET(CMAKE_C_FLAGS_DEBUG "-g -O0")
+-	SET(CMAKE_C_FLAGS_RELEASE "-O2")
+ ENDIF()
+ 
+ # Build Debug by default