According to Friedrich Fahnert:

I found a solution for the problem I was having under SunOS. I can get the program compiled if I specify the source files, to gpc, but not if I compile the files, and link them separately. Should this be considered to be a bug?

Yes. :-( Thank you for the report. I was reported a similar bug for Linux but could not reproduce it. Strange. Peter e-mail: peter.gerwinski@uni-essen.de home address: D\"usseldorfer Str. 35, 45145 Essen, Germany WWW: http://agnes.dida.physik.uni-essen.de/~peter/