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