Git error when trying to diff with Beyond Compare 4

[zartc]

For people using Git on Windows from both msys/mingw64 and cygwin:

[difftool "bc4"]
    cmd = '/c/Program Files/Beyond Compare 4/BComp.exe' -solo -readonly -vcsleft=\"${BASE} [before]\" -vcsright=\"${BASE}\" \"$(cygpath --mixed "${LOCAL}")\" \"$(cygpath --mixed "${REMOTE}")\"