Como a mensagem de erro diz,
icu required (brew install icu4c or apt-get install libicu-dev)
desde que você esteja no OS X, você deve executar:
brew install icu4c
Eu tentei muitas coisas para consertar isso, mas não consigo obter gollum
como um utilitário cli.
gem install gollum
conclui com ...
Building native extensions. This could take a while...
ERROR: Error installing gollum:
ERROR: Failed to build gem native extension.
/Users/kirkstrobeck/.rvm/rubies/ruby-2.1.0/bin/ruby extconf.rb
checking for main() in -licui18n... no
checking for main() in -licui18n... no
***************************************************************************************
*********** icu required (brew install icu4c or apt-get install libicu-dev) ***********
***************************************************************************************
*** 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=/Users/kirkstrobeck/.rvm/rubies/ruby-2.1.0/bin/ruby
--with-icu-dir
--without-icu-dir
--with-icu-include
--without-icu-include=${icu-dir}/include
--with-icu-lib
--without-icu-lib=${icu-dir}/lib
--with-icui18nlib
--without-icui18nlib
--with-icui18nlib
--without-icui18nlib
extconf failed, exit code 1
Gem files will remain installed in /Users/kirkstrobeck/.rvm/rubies/ruby-2.1.0/lib/ruby/gems/2.1.0/gems/charlock_holmes-0.6.9.4 for inspection.
Results logged to /Users/kirkstrobeck/.rvm/rubies/ruby-2.1.0/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-12/2.1.0-static/charlock_holmes-0.6.9.4/gem_make.out
$