Wow, compiling PS in Cygwin, now that is an interesting challenge!
First, I\'d advise you not to get the sources from CVS, they are not up to date. You will have problems with the /spawn command, and get strange messages on the console. Instead, download the sources from the Planeshift main site:
http://www.planeshift.it/download_source.html Yacc is a parser generator, it creates the .c sources from a grammatical description (.y files usually). You should install it from the Cygwin setup, category \"Devel\", \"bison\" (there is also a \"byacc\", you could try this one if the other doesn\'t work).
Please tell me if you succeed, it would be interesting to know.