diff --git a/rbutil/chinachippatcher/Makefile b/rbutil/chinachippatcher/Makefile
index cdcca865b0..390260ebfd 100644
--- a/rbutil/chinachippatcher/Makefile
+++ b/rbutil/chinachippatcher/Makefile
@@ -7,7 +7,6 @@
 # $Id$
 #
 CFLAGS = -g -Wall
-CC = gcc
 
 OUTPUT = chinachippatcher
 
diff --git a/rbutil/libtools.make b/rbutil/libtools.make
index d25a97127c..4e66161011 100644
--- a/rbutil/libtools.make
+++ b/rbutil/libtools.make
@@ -45,12 +45,14 @@ endif
 NATIVECC = gcc
 CC ?= gcc
 ifeq ($(findstring Darwin,$(shell uname)),Darwin)
+ifneq ($(findstring mingw,$(CROSS)$(CC)),mingw)
 # building against SDK 10.4 is not compatible with gcc-4.2 (default on newer Xcode)
 # might need adjustment for older Xcode.
 CC ?= gcc-4.0
 CFLAGS += -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4
 NATIVECC ?= gcc-4.0
 endif
+endif
 WINDRES = windres
 
 BUILD_DIR ?= $(TARGET_DIR)build