I'm building libevent in msys on winxp 32, and the build appears to have worked fine (using --enable-gcc-warnings for configure). When running make verify, I get:
FAIL regress.c:461 assert(premature_event == 0): 1 vs 0main/simpleclose: [simpleclose FAILED].
All other tests pass.
I'm closing this as a duplicate of https://sourceforge.net/tracker/?func=detail&aid=3107687&group_id=50884&atid=461322 , since there's more discussion there.