Ran into a minor problem installing Jekyll. Not sure why it happened, but here's the situation and the fix:
➜ code sudo gem install jekyll
Password:
Building native extensions. This could take a while...
ERROR: Error installing jekyll:
ERROR: Failed to build gem native extension.
/Users/mike/.rvm/rubies/ruby-2.0.0-p0/bin/ruby extconf.rb
creating Makefile
make "DESTDIR="
compiling porter.c
make: gcc-4.2: No such file or directory
make: *** [porter.o] Error 1
Gem files will remain installed in /Users/mike/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/fast-stemmer-1.0.2 for inspection.
Results logged to /Users/mike/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/gems/2.0.0/gems/fast-stemmer-1.0.2/ext/gem_make.out
This is not an uncommon problem (as Googling would prove). Lots of different answers out there, but just one worked for me. First make sure your bundler is up to date:
➜ code sudo gem update --system
...then symlink gcc to 4.2 so bundler can find the necessary make file:
➜ code sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2
That did it for me - ran sudo gem install jekyll
and it worked fine.