Cannot build gem native extension on El Capitan - fails at lstdc++

I've spent the past hour scouring the internet for any solution to this but so far have come up empty handed...

I'm trying to install a gem called taglib-ruby, which has a dependency on a c++ compiler (which one would assume is covered by gcc and Xcode Commandline Tools) and taglib (a C++ library) which I have installed using homebrew. However, it doesn't seem to get as far as trying to include that, because it fails to find lstdc++.

I'm trying to do this on OSX El Capitan (10.11).

Can someone tell me what this dependency is and how I install it?

Please see console output below:

$ gem install taglib-ruby
Building native extensions.  This could take a while...
ERROR:  Error installing taglib-ruby:
    ERROR: Failed to build gem native extension.

    /usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby -r ./siteconf20160618-66149-xswlyl.rb extconf.rb
checking for main() in -lstdc++... *** 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
    --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=/usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby
    --with-tag-dir
    --without-tag-dir
    --with-tag-include
    --without-tag-include=${tag-dir}/include
    --with-tag-lib
    --without-tag-lib=${tag-dir}/lib
    --with-stdc++lib
    --without-stdc++lib
/usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:476:in `try_link'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:619:in `try_func'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:845:in `block in have_library'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:840:in `have_library'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/taglib-ruby-0.7.1/ext/extconf_common.rb:28:in `<top (required)>'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:54:in `require'
    from extconf.rb:2:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/taglib-ruby-0.7.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/extensions/x86_64-darwin-11/1.9.1/taglib-ruby-0.7.1/gem_make.out