Mac computers normally handle printing of PDF files from the operating system level. If you are using gCADPlus on your Mac under CrossOver and want to generate a reasonable quality PDF use the File > Save as PDF option.
If you need high quality PDF output, you need to install a PDF writer. Although we favor CutePDF as our PDF writer in the Windows environment, we have not has success with it on our Mac. This link from the CrossOver people may help. They suggest that installing a freeware tool - PDFWriter - may work well and produce high quality PDF inside gCADPlus. We have been able to make it work and get high quality output as good as CutePDF, but it was a little fiddly to install.
We have been able to print PDF files from gCADPlus under CrossOver using the information on the CrossOver site. Here is the link, it is much appreciated.