How do I Install Ruby 1.9.2 with RVM on Mac OSX 10.7.3 LION?

For Lion, you need to install GCC-4.2 and set the compile to point to it:

1. Download the gcc-4.2

   This is needed for Xcode 4.2 only. Ruby project should be built using gcc rather than llvm-gcc (Lion).

   Download it from https://github.com/kennethreitz/osx-gcc-installer/downloads/

   Open "Downloads"

   Double click on "GCC-10.7-v2.pkg" to install

2. Setting the compiler

   For Lion, Rubies should be built using gcc rather than llvm-gcc.

   Since /usr/bin/gcc is linked to /usr/bin/llvm-gcc-4.2, we need to set the default complier to gcc-4.2

   Set default complier to gcc-4.2, type command: export CC=/usr/bin/gcc-4.2

Either you are running older RVM or gcc-4.2 could not be found.

Are you sure https://github.com/kennethreitz/osx-gcc-installer/downloads/ was correctly installed?

RVM automatically detects that gcc-4.2 is available and uses it for compilation, so you should be fine after:

rvm get headrvm reinstall 1.9.2 -j 2

I have added -j 2 to speed up compilation, replace the 2 with number of cores +1

There are better ways now. You can use MacPort to download and compile everything.

1. Install MacPort http://www.macports.org/

2. From a terminal window, install Ruby

   sudo port selfupdatesudo port install ruby 1.9.2

Better yet, you can use RVM to install a specific version of ruby depending on where you are:

1. Install MacPort
2. Install RVM https://rvm.io
3. cd [my work dir]
4. rvm 1.9.2