Replying to myself - in case someone does a super search on this item...

Certain distributions of Sybase on MacOSX omit the dynamic load libraries (.dyld), but include a Cocoa framework (I think that's the right term...). In that situation you have to add -framework CoreFoundation to the LDLOADLIBS and/or EXTRALIBS macro in the Makefile that is generated by perl Makefile.PL, and then rebuild.

Michael