OS X

Install 1.8.7-p371

CC=/usr/bin/gcc-4.2 rvm install 1.8.7 --without-tcl --without-tk

Use.

rvm use 1.8.7

--

Use i686-apple-darwin11-gcc-4.2.1 not i686-apple-darwin11-llvm-gcc-4.2

$ CC=/usr/local/bin/gcc-4.2 rvm install ruby-1.9.3-p392

Ruby 2.0p0 currently has problems.

Mark library as not hidden.

chflags nohidden ~/Library

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Show . folders.

defaults write com.apple.Finder AppleShowAllFiles YES

Hold alt, mouse down on Finder, then click Relaunch