我在Buildroot Linux distro for ARM（Python 2.7.2）上交叉编译netifaces扩展时遇到问题。根据这篇博客http://whatschrisdoing.com/blog/2009/10/16/cross-compiling-python-extensions/，我定义了CC、LDSHARE等环境变量，但是distutils/setuptools没有考虑CC，所以所有的测试都会失败。
running build
Setting prefix
Setting prefix
running build_ext
checking for getifaddrs... not found. (cached)
checking for getnameinfo... not found. (cached)
checking for socket IOCTLs... not found. (cached)
checking for optional header files... netash/ash.h netatalk/at.h netax25/ax25.h neteconet/ec.h netipx/ipx.h netpacket/packet.h linux/irda.h linux/atm.h linux/llc.h linux/tipc.h linux/dn.h. (cached)
checking whether struct sockaddr has a length field... no. (cached)
checking which sockaddr_xxx structs are defined... at ax25 in in6 ipx un ash ec ll atmpvc atmsvc dn irda llc. (cached)
building 'netifaces' extension
是否有其他跨平台编译的示例/教程，或者是我哪里做错了？