Android Froyo基于32 bit Ubuntu 10.10编译问题

Android代码下载的是Froyo 2.2版本的，直接make，出现错误提示：

                You are attempting to build on a 32-bit system.
                Only 64-bit build environments are supported beyond froyo/2.2

        查找资料，确定下面的修改步骤（-表示删除行，+表示添加行）：

              1、修改build/core目录下的main.mk文件，修改策略为：
                       ifeq ($(BUILD_OS),linux)
                        build_arch := $(shell uname -m)
                       -ifneq (64,$(findstring 64,$(build_arch)))
                       +ifneq (i686,$(findstring i686,$(build_arch)))
                      $(warning ************************************************************)
                      $(warning You are attempting to build on a 32-bit system.)
                      $(warning Only 64-bit build environments are supported beyond froyo/2.2.)

              2、修改下列文件：
                       /external/clearsilver/cgi/Android.mk
                       /external/clearsilver/cs/Android.mk
                       /external/clearsilver/java-jni/Android.mk
                       /external/clearsilver/util/Android.mk
                     4个文件的修改策略相同，为：
                       # This forces a 64-bit build for Java6
                        -LOCAL_CFLAGS += -m64
                        -LOCAL_LDFLAGS += -m64
                        +LOCAL_CFLAGS += -m32
                        +LOCAL_LDFLAGS += -m32