Package: g++-mingw-w64-i686

"g++-mingw-w64-i686" package binaries on Debian:

/usr/bin/i686-w64-mingw32-c++-posix /usr/bin/i686-w64-mingw32-c++-win32 /usr/bin/i686-w64-mingw32-g++-posix /usr/bin/i686-w64-mingw32-g++-win32

You may install this package on Debian with apt-get install g++-mingw-w64-i686