Hi, I managed to get bison-2.4.1 run with cygport. So, I hereby kindly request the update of the cygwin package, please find the files at http://www.petschke.com/bison/bison-2.4.1-1.cygport http://www.petschke.com/bison/bison-2.4.1-1.tar.bz2 http://www.petschke.com/bison/bison-2.4.1-1-src.tar.bz2 Kind regards Thomas Lemm