Monday, September 28, 2015
There are 2 problems:
- Even though installing ruby seems possible without source files (eg ruby.h) using eg rvm, ruby-install etc, subsequently installing rails as a gem requires these files. To avoid version mismatch with the versions from your os (package manager eg yum, yast, apt) its best to build ruby from source.
- nokogiri seems to have a bug. Installing rails as a ruby gem fails because of nokogiri wanting to bring in its own version of some dev fies (eg libxml2, libxslt). So you should install nokogiri separately first explicitly telling it not to use these files.
Download Ruby - build from source
Make sure in your os package manager (yum, yast, apt etc) that you install any prerequisites for building c fies eg
c compiler, make, etc
c compiler, make, etc
Additionally make sure the following are installed:
# libxml2-devel, libxslt-devel (for nokogiri)
# nodejs for runtime (server)
> cd ~/declan/Downloads/ruby-2.2.3
#create dir below first manually as user "declan" otherwise they will automatically get created belonging to root
> ./configure --prefix=/home/declan/dev/web_framework/rails/ruby/2.2.3/
> make
> sudo make install
Dowload and install "chruby" (https://github.com/postmodern/chruby)
# cd /home/declan/tmp/
wget -O chruby-0.3.9.tar.gz https://github.com/postmodern/chruby/archive/v0.3.9.tar.gz
tar -xzvf chruby-0.3.9.tar.gz
cd chruby-0.3.9/# install (to local dir .. dont need sudo)
# dont use setup.sh ...see below
> PREFIX=/home/declan/dev/web_framework/rails/chruby/0.3.9/ make install# !! dont do this since it adds a "chruby.h" file to /etc/profile.d/ which causes share/chruby/auto.sh to get run each system boot .. dont want this
# sudo /home/declan/tmp/chruby-0.3.9/scripts/setup.sh
# by default installs to "/usr/local/share/chruby/"
# edit chruby.sh to tell it about our custom ruby
# /home/declan/dev/web_framework/rails/chruby/0.3.9/share/chruby/chruby.sh
RUBIES+=("/home/declan/dev/web_framework/rails/ruby/2.2.3/")Now you have a clean locally installed version of rails (which is independent of any system version), which you can "activate via
> source /home/declan/dev/web_framework/rails/chruby/0.3.9/share/chruby/chruby.sh
> chruby 2.2.3
> ruby --version # 2.2.3
> gem install rubygems-update # update gem itself
One should be able to install rails as a gem now, but apparently nokogiri bringing its own versions of files like libxml2-devel, libxslt-devel causes error messages like youre having, so manually install it first explicitly telling it not to use these:
> gem install nokogiri -- --use-system-libraries Now install rails itself
> gem install rails
> rails --version
Rails 4.2.4
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