Building with MinGW

Has anyone had success following the instructions at
https://wiki.postgresql.org/wiki/Building_With_MinGW#Installing_Git
recently?

I've followed the instructions to set up the build environment on a Windows
box, and I can't build from git. I can from the nightly tarball. So I
think the most recent environment you get when following these instructions
has suffered some regression in the bison, yak, or something else involved
in building from git but not from tarball.

Also, is there anyway to know the exact git commit which the nightly
tarballs are build against?

Cheers,

Jeff