error: failed to build gem native extension when installing rails on mac mountian lion os

Question

I\'ve recently updated to Mountain Lion and re-installed Ruby, but when I try to run a test Rails app, I get an error message that says that \"Rails is not currently install

Answer 1

I ran into this issue as well, with Mountain Lion. The gem that was failing installation was json. To fix it, I installed the xcode CLI tools and then just symlinked the installed gcc (i686-apple-darwin11-llvm-gcc-4.2) as /usr/bin/gcc-4.2. Once this was done, it just worked.

While trying to install another gem, I ran into a similar issue where the native build step complained about missing g++-4.2. I symlinked this exactly the same as I did with gcc-4.2 above, and it worked.

UPDATE: OSX Mavericks with latest RVM

With the latest OSX 10.9 and latest RVM, these issues seem to have gone away. So, time to upgrade.