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Asked: 2026-06-01T12:46:17+00:00

I didn’t know that installing ruby is such a pain After lot of trouble

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I didn’t know that installing ruby is such a pain
After lot of trouble with curl certificate, I installed the rvm using the methods mentioned in the rvm site also with lot of help from stackoverflow questions.
Now I am trying to install rails using the gems command

gem install rails

but I always get this error

   ERROR:  Loading command: install (LoadError)
   cannot load such file -- zlib
   ERROR:  While executing gem ... (NameError)
   uninitialized constant Gem::Commands::InstallCommand

I did follow every thing mentioned here https://rvm.beginrescueend.com/packages/zlib/
and also as a mentioned in a stackoverflow post

I did install all the tools as required by the requirements

   yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison iconv-devel

But still I get this error. When I looked at the build log for ruby under
/usr/local/rvm/log/ruby-1.9.3-p125/configure.log
I see this error 

  [2012-04-07 01:13:44]  ./configure --prefix=/usr/local/rvm/rubies/ruby-1.9.3-p125 --enable-shared --disable-install-doc --with-zlib --with-opt-dir=/usr/local/rvm/usr --with-libyaml
  configure: WARNING: unrecognized options: --with-zlib, --with-libyaml

Is the rvm broken ? or is there a problem while building the ruby src.

Note: I am running fedora 14

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1 Answer

  1. Editorial Team

    RVM causes more problems than it solves (IMHO). Better tools are ruby-build and rb-env. Newer tools that look very good too are ruby-install and chruby.

    Here are my notes from my recent Red Hat Enterprise Linux (RHEL) installation of Ruby, which I believe is pretty similar to Fedora. Perhaps these notes can be of some help to you. Ask me questions if you like.

    Install zlib

    yum install zlib zlib-devel

    Install YAML

    export k=yaml v=0.1.4
wget http://pyyaml.org/download/libyaml/$k-$v.tar.gz
tar zxvf $k-$v.tar.gz
cd $k-$v 

./configure
make && make install

    Install X11 if you want X or headless browsing for testing

    yum install 
  xorg-x11-fonts-misc
  xorg-x11-fonts-truetype
  xorg-x11-server-Xorg
  xorg-x11-server-Xvfb

    Install libraries

    yum install 
  gdbm gdbm-devel
  ncurses ncurses-devel
  openssl openssl-devel
  readline readline-devel
  tk tk-devel
  libjpeg libjpeg-devel
  libpng libpng-devel
  libxml2 libxml2-devel
  libxslt libxslt-devel
  zlib zlib-devel

    Install ruby-build

    cd /opt
git clone git://github.com/sstephenson/ruby-build.git
cd ruby-build/
./install.sh

    Install Ruby

    export k=ruby v=1.9.3-p125
wget http://ftp.ruby-lang.org/pub/ruby/1.9/$k-$v.tar.gz
tar zxvf $k-$v.tar.gz
cd $k-$v

# Either onfigure with defaults...
./configure 

# Or configure with custom locations...
./configure --prefix=/opt/$k/$v --enable-shared --with-opt-dir=/opt/yaml/current

make && make check && make install

    Environment

    Edit /etc/environment to add this:

    RUBYOPT='-r rubygems -r psych'

    If you put Ruby in a custom directory, also merge this with your existing path:

    PATH=/opt/ruby/1.9.3-p125/bin  (or wherever you put it)

    Load environment:

    source /etc/environment

    Verify gem runs and you see the intial set of gems:

    gem list

    Gem update:

    gem update --system
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