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The binary at http://sourceforge.net/projects/rtcw-osx works fine on Intel Macs with the version of RtcW offered by GOG! (at least on a Late 2014 running OS X 10.9.5).

Edit: I've now tested it!

Limitations:
* no widescreen resolutions (although that may be solvable via console commands)
* some resolutions result in the display getting right aligned on the screen instead of centered and/or very dark. The standard ones (640x480, 800x600 and 1024x768) work well though.
* the game crashes if you click on "Driver info" in the options

Other than that it runs fine, at least in the short multiplayer session I've just tried! Make sure to turn on "Dynamic lighting" under "Game Options" - "Performance".
Post edited October 01, 2015 by jmaebe
Or even better: https://github.com/iortcw/iortcw/releases