gistfile1.txt

$ gem install json -v '1.8.3'
Building native extensions.  This could take a while...
ERROR:  Error installing json:
        ERROR: Failed to build gem native extension.

    /home/bugo/.rvm/rubies/ruby-2.2.4/bin/ruby -r ./siteconf20151219-26737-u1beea.rb extconf.rb
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling generator.c
linking shared-object json/ext/generator.so
/usr/bin/ld: cannot find -lgmp
collect2: error: ld returned 1 exit status
make: *** [generator.so] Error 1

make failed, exit code 2

Gem files will remain installed in /home/bugo/.rvm/gems/ruby-2.2.4/gems/json-1.8.3 for inspection.
Results logged to /home/bugo/.rvm/gems/ruby-2.2.4/extensions/x86_64-linux/2.2.0/json-1.8.3/gem_make.out