I get the following output when trying to install json gem on lion:
gem install json -v ‘1.7.3’ Building native extensions. This could
take a while… ERROR: Error installing json: ERROR: Failed to build
gem native extension./Users/victorstan/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb creating Makefile
make compiling parser.c make: /usr/bin/gcc-4.2: No such file or
directory make: * [parser.o] Error 1
Use
which gccand create a symlink to it in /usr/bin/gcc-4.2. e.g.