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/home/daniel/.rvm/rubies/ruby-2.2.3/bin/ruby -r ./siteconf20160127-28885-k8y4i3.rb extconf.rb
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/home/daniel/.rvm/rubies/ruby-2.2.3/bin/$(RUBY_BASE_NAME)
        --with-ffi_c-dir
        --without-ffi_c-dir
        --with-ffi_c-include
        --without-ffi_c-include=${ffi_c-dir}/include
        --with-ffi_c-lib
        --without-ffi_c-lib=${ffi_c-dir}/lib
        --with-libffi-config
        --without-libffi-config
        --with-pkg-config
        --without-pkg-config
/home/daniel/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from /home/daniel/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:541:in `try_link0'
        from /home/daniel/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:556:in `try_link'
        from /home/daniel/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:637:in `try_ldflags'
        from /home/daniel/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/mkmf.rb:1780:in `pkg_config'
        from extconf.rb:15:in `<main>'

extconf failed, exit code 1