Perhaps your problem was already discussed on the list. There is a searchable archive of the mailing list on the WWW. It can be browsed or searched at
http://www.gnu-pascal.de/crystal/gpc/en/
The archive of the documentation list is at
http://www.gnu-pascal.de/crystal/gpc-doc/en/
The archive of the announce list is at
http://www.gnu-pascal.de/crystal/gpc-announce/en/
The archive of the German GPC list is at
http://www.gnu-pascal.de/crystal/gpc-de/de/