I wouldn't use the Makefile generated on Win, but rather use the one generated on Linux since the libraries that are needed for linking may be similar.
I also had to use gmake for building, since BSD make made problems. I think it's enough to have a good Makefile for Solaris that needs gmake for the first step.
I am also going to maintain the source release and we should think about common Makefile(s) for *nix OSs.