Running id3lib-ruby on Heroku - heroku

Question

I'm attempting to resurrect some old code which used id3lib-ruby and id3lib to run on Heroku and am not having any luck with it - can someone tell me if its supported? I know that the id3lib-ruby gem itself is no longer supported, but just wondering if I can run it on Heroku?
Here is the error I'm getting:
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/tmp/build_3287hfmgqe8t8/vendor/ruby-2.0.0/bin/ruby extconf.rb
checking for main() in -lstdc++... yes
checking for main() in -lz... yes
checking for main() in -liconv... no
checking for id3.h... no
You must have id3lib installed in order to use id3lib-ruby.
*** 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=/tmp/build_3287hfmgqe8t8/vendor/ruby-2.0.0/bin/ruby
--with-stdc++lib
--without-stdc++lib
--with-zlib
--without-zlib
--with-iconvlib
--without-iconvlib
Gem files will remain installed in /tmp/build_3287hfmgqe8t8/vendor/bundle/ruby/2.0.0/gems/id3lib-ruby-0.6.0 for inspection.
Results logged to /tmp/build_3287hfmgqe8t8/vendor/bundle/ruby/2.0.0/gems/id3lib-ruby-0.6.0/ext/id3lib_api/gem_make.out
An error occurred while installing id3lib-ruby (0.6.0), and Bundler cannot
continue.
Make sure that `gem install id3lib-ruby -v '0.6.0'` succeeds before bundling.
Failed to install gems via Bundler.
Push rejected, failed to compile Ruby/Rails app
Does anyone have any ideas?
Thanks...Chris

Answer 1

4 months late but...
The error is because id3lib-ruby requires the id3lib header and library files to be available in order to be successfully installed (as the error says, it builds a native extension). Heroku doesn't have these available by default, so you have to install them with a buildpack (https://devcenter.heroku.com/articles/buildpacks).
I was just in the same boat so I wrote a Heroku buildpack to install id3lib which can be composed (using heroku-buildpack-multi) with their ruby buildpack to allow id3lib-ruby to be built: https://github.com/benalavi/buildpack-id3lib