Hi, I wrote a simple shell function for switching GHC version on the
system. It works only under Mac OSX, and only switch GHCs installed
via .pkg installers. It's useful to experiment newer features without
worrying breaking environment.
FWIW I'd consider two alternatives:
(2) instead of using the bundled create-links, have the /usr/bin scripts check a per-user symlink and fall back to a system one; running the select script as root sets the system symlink, running as user sets the per-user symlink.