【求助】关于Cygwin下装gcc的问题!

$ ./configure
loading cache ./config.cache
checking host system type ... i686-pc-cygwin
checking target system type ... i686-pc-cygwin
checking build system type ... i686-pc-cygwin
checking for a BSD compatible install ... /usr/bin/install -c
*** this configuration is not supported in the following subdirectories:
   target-libffi target-boehm-gc target-zlib target-libjava
    <Any other directories should still work fine.>
cc:not found
*** The command ' cc -o conftest  -g conftest.c' failed.
*** You must set the environment variable CC to a working compiler.

这是错误信息,请问该怎么办?? 各位大侠帮帮忙啊!!