according to the quadra website and my personal experience, quadra does not compile on gcc 3.1 without a patch. solution: use the attached patch, its from quadra.sourceforge.net i also attached a quadra-1.1.8-r1.ebuild, the digest-file can be copied of course.
Created attachment 3938 [details, diff] patch from quadra website patch into files dir
Created attachment 3939 [details] quadra-1.1.8-r1.ebuild ebuild file
added to cvs