Mac OS X disk image with *relocatable application bundle*. Needs
[[xquartz][<xquartz:>]] (X11) installed for running the [[development
tools][</IDE.html>]]. Currently, version 2.7.11 is required. You can
check the version by opening an X11 application and then checking
`about' in the X11 menu. The bundle also provides the commandline tools
in =Contents/MacOS=. The command line tools need at least MacOS *10.6*
(Snow Leopard). The graphical application needs at least MacOS *10.7*
(Lion).