Fetching: json-1.8.2.gem (100%)
    Building native extensions.  This could take a while...
    ERROR:  Error installing hipchat:
            ERROR: Failed to build gem native extension.

        /opt/sensu/embedded/bin/ruby extconf.rb
    creating Makefile

    make "DESTDIR="
    compiling generator.c
    make: gcc: Command not found
    make: *** [generator.o] Error 127


    Gem files will remain installed in /opt/sensu/embedded/lib/ruby/gems/2.0.0/gems/json-1.8.2 for inspection.
    Results logged to /opt/sensu/embedded/lib/ruby/gems/2.0.0/gems/json-1.8.2/ext/json/ext/generator/gem_make.out