From: Brian Candler <b.candler@...>
Date: 2010-02-15T18:49:50+09:00
Subject: Re: building ruby on rails

Michael Felt wrote:
> I have downloaded ruby-1.91-1-p376, configured and built
> 
> (./configure --with-pthreads; make;make install)
> 
> downloaded rubygem 1.3.5, unpacked, then
> 
> ruby setup.rb
> 
> And when I run
> 
> # gem install rails
> 
> I get the following error:
> # gem install rails
> /usr/local/lib/ruby/site_ruby/1.9.1/rubygems/package.rb:10:in `require': 
> no
> such file to load -- zlib (LoadError)

This means that ruby zlib library wasn't built when you were building 
ruby 1.9, but rubygems needs it.

The solution depends on what system you are building under. For example, 
if you are building under Ubuntu, then you need to do

    sudo apt-get install zlib1g-dev

then reconfigure and rebuild ruby 1.9 from scratch, so it can detect the 
zlib header files and build the ruby zlib extension, then try and build 
rubygems again.

I'd also recommend

    sudo apt-get install libssl-dev

before building ruby, because without this, ruby won't have openssl 
support and hence can't do HTTPS.

Regards,

Brian.
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