After reinstalling MSYS2 due to a disk crash, I noticed that GCC new version is 5.4. So you will find in my RT drive
master branch 4.2.922 (release and debug)
GTK3 branch 4.2.1064 (release and debug)
built with GCC 5.4.0
913 and 1060 builds are still there.
I don't know how to come back to GCC 5.3.