I run the "pacman -Syu" command to update the tools on every release before attempting to compile.
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Code:
[MINGW64] d:\mamedev\msys64\src>pacman -Syu :: Synchronizing package databases... mingw32 is up to date mingw64 is up to date msys is up to date mame is up to date :: Starting core system upgrade... there is nothing to do :: Starting full system upgrade... there is nothing to do