在通过gollum-wiki重新安装ruby v2.2.2后，我无法安装rbenv。
我跑Ubuntu-Gnome 14.04 Trusty Thar。
这是安装日志：
user@host:~/dev/drafts$ gem install gollum
Fetching: useragent-0.10.0.gem (100%)
Successfully installed useragent-0.10.0
Fetching: mustache-0.99.8.gem (100%)
Successfully installed mustache-0.99.8
Fetching: rack-1.6.4.gem (100%)
Successfully installed rack-1.6.4
Fetching: rack-protection-1.5.3.gem (100%)
Successfully installed rack-protection-1.5.3
Fetching: tilt-2.0.1.gem (100%)
Successfully installed tilt-2.0.1
Fetching: sinatra-1.4.6.gem (100%)
Successfully installed sinatra-1.4.6
Fetching: kramdown-1.6.0.gem (100%)
Successfully installed kramdown-1.6.0
Fetching: github-markup-1.3.3.gem (100%)
Successfully installed github-markup-1.3.3
Fetching: mini_portile-0.6.2.gem (100%)
Successfully installed mini_portile-0.6.2
Fetching: nokogiri-1.6.6.2.gem (100%)
Building native extensions. This could take a while...
Successfully installed nokogiri-1.6.6.2
Fetching: sanitize-2.1.0.gem (100%)
Successfully installed sanitize-2.1.0
Fetching: stringex-2.5.2.gem (100%)
Successfully installed stringex-2.5.2
Fetching: rouge-1.9.1.gem (100%)
Successfully installed rouge-1.9.1
Fetching: diff-lcs-1.2.5.gem (100%)
Successfully installed diff-lcs-1.2.5
Fetching: mime-types-1.25.1.gem (100%)
Successfully installed mime-types-1.25.1
Fetching: posix-spawn-0.3.11.gem (100%)
Building native extensions. This could take a while...
Successfully installed posix-spawn-0.3.11
Fetching: charlock_holmes-0.7.3.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing gollum:
ERROR: Failed to build gem native extension.
/home/poremil/.rbenv/versions/2.2.2/bin/ruby -r ./siteconf20150818-19908-1246gx8.rb 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=/home/poremil/.rbenv/versions/2.2.2/bin/$(RUBY_BASE_NAME)
--with-icu-dir
--without-icu-dir
--with-icu-include
--without-icu-include=${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 /home/poremil/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/charlock_holmes-0.7.3 for inspection.
Results logged to /home/poremil/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/extensions/x86_64-linux/2.2.0-static/charlock_holmes-0.7.3/gem_make.out
只需通过libicu-dev安装apt
$ sudo apt-get install libicu-dev
然后安装gollum
$ gem install gollum
对于Mac用户：
brew install icu4c
为我解决了这个问题。
与GitLab EE omnibus安装相同的问题，解决方法是：
apt-get install ruby ruby-dev make zlib1g-dev libicu-dev build-essential git cmake