- starting with Mountain Lion X11 for Mac OS X is available on a separate website: xquartz.macosforge.org, support.apple.com/kb/HT5293
- RCS binaries get provided in /Developer/usr/bin, but e.g. “rcsdiff” makes use of a hard-wired “co” by the full path of /usr/bin/co; my fix for this: I symlinked ../Developer/usr/bin/co to /usr/bin/co.
- you need XCode of course
- as a Fink user, you need to (re-)install Fink from fink.sf.net (coreutils, wget, xv, xpdf)