t / t5100 / rfc2047-info-0004on commit git-compat-util.h: don't define _XOPEN_SOURCE on cygwin (3a0a3a8)
   1Author: Nathaniel Borenstein (םולש ןב ילטפנ)
   2Email: nsb@thumper.bellcore.com
   3Subject: Test of new header generator
   4