I notice buildfarm member snake is unhappy:
The program "postgres" is needed by initdb but was not found in the
same directory as
"C:/msys/1.0/local/build-farm/HEAD/pgsql.696/src/test/regress/tmp_check/install/usr/local/build-farm/HEAD/inst/bin/initdb.exe".
Check your installation.
I'm betting Peter's recent patch to merge postmaster and postgres missed
some little thing or other ...
regards, tom lane