Hi Marcus, This discussion probably belongs on the radiance-dev group, not general. Sounds like Cygwin doesn't work with the current script to make Version.c. Copy the following file to your ray/src/rt directory and try recompiling. -Greg ------------- Version.c /* * This file was created automatically during make. */ char VersionID[]="RADIANCE 3.6a lastmod Tue Oct 21 19:07:42 PDT 2003