I do not know, but if I recall correctly there was an issue with 0.8 where the - then current - MinGW installer would grab packages incompatible with the Rust 0.8 binaries so you first had to setup the current version of MinGW, and then use MinGW's own package manager to rollback to a version compatible with the Rust build.

This had been fixed since. You should be able to use mingw without rolling back anything.