Building PHP4 Problem

Its my first time out building PHP, so bare with me. Downloaded everything and set it up. No problem setting the paths and environment variables. When I start the build process either in the GUI or from the command line, it gets to zend_language_parser.y and tries to execute the external command to build it. However, bison complains about the -S option that is in the custom command: The Command is: if not "X%CYGWIN%"=="X" bison --output=zend_language_parser.c -v -d -S "%CYGWIN%\share\bison.simple" -p zend zend_language_parser.y if "X%CYGWIN%"=="X" bison --output=zend_language_parser.c -v -d -S "C:\Program Files\Cygnus\share\bison.simple" -p zend zend_language_parser.y I've got CYGWIN set, so the first "if" should be hitting. Any idea why this is there, or why it is being misinterpreted? Greg Sohl Cedar Rapids, IA