# Pastebin Gvd5D266
Building native extensions.  This could take a while...
ERROR:  Error installing nokogiri:
	ERROR: Failed to build gem native extension.

    current directory: /Users/matt/.gem/ruby/2.1.0/gems/nokogiri-1.6.8/ext/nokogiri
/nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/bin/ruby -r ./siteconf20171206-58362-1mm4u1q.rb extconf.rb
Using pkg-config version 1.1.9
checking if the C compiler accepts ... *** 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=/nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/bin/ruby
	--help
	--clean
/nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/lib/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/lib/ruby/2.1.0/mkmf.rb:571:in `block in try_compile'
	from /nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/lib/ruby/2.1.0/mkmf.rb:522:in `with_werror'
	from /nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/lib/ruby/2.1.0/mkmf.rb:571:in `try_compile'
	from extconf.rb:138:in `nokogiri_try_compile'
	from extconf.rb:162:in `block in add_cflags'
	from /nix/store/z99p31v3cpxsrpb84rcsrg4mwh6gi407-ruby-2.1.10/lib/ruby/2.1.0/mkmf.rb:619:in `with_cflags'
	from extconf.rb:161:in `add_cflags'
	from extconf.rb:414:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/matt/.gem/ruby/2.1.0/extensions/x86_64-darwin-16/2.1.0/nokogiri-1.6.8/mkmf.log

extconf failed, exit code 1