Linuxbrew is preliminary, if you stumbled at beginning, here is a temporary solution

[janckerchen]

Linuxbrew need you take care of your environment, here's solution from @sjackman, it works for me

#how to bring homebrew to linux
git clone https://github.com/Homebrew/linuxbrew.git ~/
PATH=~/linuxbrew/bin:$PATH
HOMEBREW_PREFIX=~/linuxbrew
HOMEBREW_CACHE=$HOMEBREW_PREFIX/Library/Caches/Homebrew
ln -s /usr/bin/gcc $HOMEBREW_PREFIX/bin/gcc-4.2
ln -s /usr/bin/g++ $HOMEBREW_PREFIX/bin/g++-4.2
brew install ruby  #for test

enjoy!

It is not smooth way, but works.

[MikeMcQuaid]

Perhaps made a pull request to amend the README? You shouldn't need to set HOMEBREW_PREFIX. @sjackman Would be good to fix the need to change HOMEBREW_CACHE and the gcc/g++ symlink.

[jaimeMF]

You can also install clang, which I've used to build ruby and git without problems.

[sjackman]

I've fixed it so that Homebrew looks for gcc and g++ on non-MacOS systems rather than gcc-4.2 and g++-4.2.
ce18453 GCC is named gcc-4.2 on MacOS and gcc elsewhere

[funnell]

These instructions don't work for me. This is what I get when trying to install ruby:
$ brew install ruby
Error: Function not implemented - /share/lustre/tfunnell/linuxbrew/Library/Caches/Homebrew/Formula/ruby.brewing