title: Unable to install pip using python on unix
body: <p>I'm trying to install pip module for python using the command <code>python ./get-pip.py -v</code> but it returns an error that zlib is not available:</p>
  
  <pre><code>[root@centos1 yum.repos.d]# python ./get-pip.py -v
  Traceback (most recent call last):
    File "./get-pip.py", line 19177, in &lt;module&gt;
      main()
    File "./get-pip.py", line 194, in main
      bootstrap(tmpdir=tmpdir)
    File "./get-pip.py", line 82, in bootstrap
      import pip
  zipimport.ZipImportError: can't decompress data; zlib not available
  </code></pre>
  
  <p>When I tried to query for zlib, I see that it's already present:</p>
  
  <pre><code>[root@centos1 yum.repos.d]# rpm -qa | grep --color=auto -i 'zlib'
  zlib-devel-1.2.3-7.el5
  perl-Compress-Zlib-1.42-1.fc6
  zlib-1.2.3-7.el5
  perl-IO-Zlib-1.04-4.2.1
  </code></pre>
  
  <p>I tried installing zlib-devel, but still get the same error:</p>
  
  <pre><code>zipimport.ZipImportError: can't decompress data; zlib not available
  </code></pre>
  
  <p>How do I fix this and proceed in installing pip, as i've a need to proceed with the installation of awscli.</p>