I've been getting an Msys2 environment working, and will soon document how to build with this environment. There are several nice things about it, including a modern version of perl and proper support for the mingw-w64 compilers.
So far the only thing I have found that needs to be changed for us to support it is this, which is so trivial and low risk that I propose to backpatch it to all live releases: diff --git a/src/bin/pg_upgrade/test.sh b/src/bin/pg_upgrade/test.sh index a805018..45ccd8f 100644 --- a/src/bin/pg_upgrade/test.sh +++ b/src/bin/pg_upgrade/test.sh @@ -34,7 +34,7 @@ standard_initdb() { testhost=`uname -s` case $testhost in - MINGW*) + MINGW*|MSYS*) LISTEN_ADDRESSES="localhost" PGHOST=localhost ;; cheers andrew -- Andrew Dunstan https://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services