As isaid, i used to make builds using the method described here (with VS 2015 at the time) :
https://github.com/BrunoReX/build-sc...MASH/readme.md
I've been able to find out the main issue, it's probably a change in msys2 behavior, which doesn't keep the %PATH% by default.
I fixed it, make all the gcc builds, but when compiling the VS project, i have the following error :
LINK : fatal error LNK1104: unable to open file 'lsmash.lib'
I take any idea or advice.