build_mingw64

   1 MINGW=/opt/mingw64
   2 export PATH=$PATH:$MINGW/bin
   3 export CFLAGS="-fno-tree-vectorize"
   4 export CXXFLAGS="$CFLAGS"
   5 cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/modules/Win64Toolchain.cmake -DCMAKE_MODULE_PATH=`pwd`/../cmake/modules/
   6