Why can't I install Rails on Lion using RVM?

Fixed it!

The answer was actually on one of the links I posted above. Before installing a version of ruby (rvm install 1.8.7) I needed to run "export CC=/usr/bin/gcc-4.2". With that in place, everything ran smoothly.

If you don't want to have CC permanently exported, you can do CC=/usr/bin/gcc-4.2 rvm install 1.8.7

If you have already installed ruby 1.8.7. Just do CC=/usr/bin/gcc-4.2 rvm reinstall 1.8.7

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If you have installed Xcode 4.2, it actually doesn't install non-LLVM gcc anymore, so you have to add it. For some reason downgrading to 4.1 after you've installed 4.2 doesn't work correctly (at least it didn't for me and others have had similar issues).

After quite a bit of thrashing, this is what finally worked for me:

Install Xcode 4.2 from App Store Install darwin gcc using the OSX gcc installer Install REE making sure you remove any vestiges of previous attempts:

Close any open terminal windows, open a fresh one and

rvm remove ree
export CC=/usr/bin/gcc-4.2
rvm install ree

This worked for me with rvm 1.8.6, OS X 10.7.2 and gcc-4.2 version 4.2.1 (Apple build 5666).

If you have already installed Xcode 4.1, resist the urge to upgrade to 4.2 and you should be okay.

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If that still doesn't work add --force. So this becomes:

CC=/usr/bin/gcc-4.2 rvm install ruby-1.8.7 --force

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Make sure that you remove 1.8.7 if you already installed it before using "export CC=/usr/bin/gcc-4.2" by doing "rvm remove 1.8.7"

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I had the same issue on my system. I installed the Xcode command line tools from Apple which ships with LLVM compiler and without an LLVM free one.

Ruby 1.8.7 won't work with an LLVM compiler not even with CC=clang, so installing an LLVM free gcc solves the problem.

There are multiple options listed here:

https://github.com/mxcl/homebrew/wiki/Custom-GCC-and-cross-compilers

Long story short, install GCC v4.2 with Homebrew:

brew install https://raw.github.com/Homebrew/homebrew-dupes/master/apple-gcc42.rb

and then install ruby 1.8.7:

CC=gcc-4.2 rvm install 1.8.7

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Instead of "export CC=/usr/bin/gcc-4.2" do "export CC=gcc" (xCode 4.2.x should be installed).

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Check which version of gcc you have like this:

ls -Al `which gcc-4.2`

I followed the instructions here: http://robots.thoughtbot.com/post/27985816073/the-hitchhikers-guide-to-riding-a-mountain-lion

brew update
brew tap homebrew/dupes
brew install apple-gcc42

Then reinstall:

Check again what your path to gcc is (to use for CC=):

ls -Al `which gcc-4.2`

(optional) You can set this in your .bashrc for example:

export CC=/usr/bin/gcc-4.2

(optional) remove any old version of ruby

rvm remove 1.8.7

Then:

CC=/usr/local/bin/gcc-4.2 rvm --verify-downloads 1 reinstall 1.8.7-p357 --without-tcl --without-tk 

or if you have set CC in your profile

rvm --verify-downloads 1 reinstall 1.8.7-p357 --without-tcl --without-tk 

Note the flags on the rvm install. I had trouble verifying the checksum on the ftp server and some problems with tck and what not. You may be able to omit those flags.

Also: you might need to remove an old version of your gemset:

rvm gemset delete <gemset>

Then

gem install bundler
bundle install

Hope this helps.

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Using macport and ruby-1.9.x version. I did successfully install rails with ruby gem.

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I have same problem only for arch x86_64, when I comment line in my ~/.rvmrc

rvm_archflags="-arch x86_64"

Open a new terminal and tried to install ruby-1.8.7 again

rvm install 1.8.7

It was successful.

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If you're using RVM in a development workflow, I added a fix in an .rvmrc file for OS X Lion.

https://gist.github.com/1112962

(updated file name)

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This is not related to RVM, but if what you are looking for is a local development environment for Lion you may want to give a try to RubyStack It is a free, open source all-in-one installer for Apache, MySQL, Ruby, Rails, etc. It does not require compilation and it is self-contained so if you do not like it you can simply remove the installation directory and you are done. Disclaimer: I'm one of the RubyStack developers :)

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CC=/usr/bin/gcc-4.2 rvm install 1.8.7 did not work for me, I used CC=/usr/bin/gcc rvm install 1.8.7 and it did (checking with "which gcc")

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Even with all the other suggestions on this page I was still getting segfaults and getting frustrated, so I said "screw it!" and use the system-provided Ruby 1.8.7:

rvm use system

You need to use sudo for installing gems, but still waay less headache.

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My solution was to override the /usr/bin/gcc symlink in the terminal. Here's how I did it:

https://plus.google.com/101970693023462019144/posts/eYVLvMCqTmc

This not only fixed my RVM installation, but also made sure that installing gems with native extensions (like rmagick) work.

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