配置gmp可能会遇到问题:
checking for suitable m4... configure: error: No usable m4 in $PATH or /usr/5bin (see config.log for reasons).
只需要安装m4即可!
编译gmp
../../src/gmp/configure --host=i686-pc-mingw32 --build=mingw32 --disable-shared
make
sudo make install