I'm migrating a PPWIZARD project from Windows XP to Mac OS X. It can't run because there's a known bug in Regina-REXX that will be fixed in the next release, but I need it now, and if I need it now I have to change one number in the source and build from source. I don't know what to download or what to do next. My level of expertise is that I've been using computers for almost 50 years but only two weeks on the Mac, and as a Windows user I rarely, if ever, build from source.