/usr/bin/x86_64-w64-mingw32-cpp-posix
/usr/bin/x86_64-w64-mingw32-cpp-win32
/usr/bin/x86_64-w64-mingw32-gcc-4.9-posix
/usr/bin/x86_64-w64-mingw32-gcc-4.9-win32
/usr/bin/x86_64-w64-mingw32-gcc-ar-posix
/usr/bin/x86_64-w64-mingw32-gcc-ar-win32
/usr/bin/x86_64-w64-mingw32-gcc-nm-posix
/usr/bin/x86_64-w64-mingw32-gcc-nm-win32
/usr/bin/x86_64-w64-mingw32-gcc-posix
/usr/bin/x86_64-w64-mingw32-gcc-ranlib-posix
/usr/bin/x86_64-w64-mingw32-gcc-ranlib-win32
/usr/bin/x86_64-w64-mingw32-gcc-win32
/usr/bin/x86_64-w64-mingw32-gcov-posix
/usr/bin/x86_64-w64-mingw32-gcov-win32
You may install this package on Debian with
apt-get
install gcc-mingw-w64-x86-64