I can't compare with the "official" builds, as I don't know how the "official" builds were created. I guess they don't contain lavf and ffms which MABS does include. And MABS uses MSYS2 / MinGW with GNU C/C++ in a current stable release (v10.1 at the moment). My latest build is
linked and documented here.
I can't use ICL, I don't have any experience with it.