title: Installing GNU Radio with pybombs, Cannot find a source URI for package python
body: <p>I'm trying to get gnu radio installed on a virtual machine.  The VM is CentOS 6.5.  I used the a vagrant box for 64bit Centos 6.5 Minimal.  CentOS 6.5 already has python 2.6 and it's unwise to change the default python because yum and other packages depend on it.  I installed python 2.7 alongside it because I'm trying to use pybombs to install gnuradio.</p>
  
  <p>Here are the changes I've made to the virtual machine in an attempt to download gnuradio:</p>
  
  <pre><code>su -
  yum groupinstall -y 'development tools'
  yum install -y zlib-devel bzip2-devel openssl-devel xz-libs wget
  </code></pre>
  
  <p>I downloaded python 2.7, unzipped, and placed in shared directory
  cd to python2.7 directory</p>
  
  <pre><code>./configure --prefix=/usr/local
  make
  make altinstall
  
  yum install epel-release
  
  curl -O https://bootstrap.pypa.io/get-pip.py
  python2.7 get-pip.py
  
  pip2.7 install --upgrade setuptools
  pip2.7 install PyBOMBS
  pybombs recipes add gr-recipes git+https://github.com/gnuradio/gr-recipes.git
  
  pybombs recipes add gr-etcetera git+https://github.com/gnuradio/gr-etcetera.git
  
  pybombs prefix init /usr/local -a myprefix
  
  pybombs -p /usr/local install gnuradio
  </code></pre>
  
  <p>This is the error I get:</p>
  
  <pre><code>PyBombs.install - INFO - Installing package: python
  PyBombs.Packager.source - WARNING - Cannot find a source URI for package python
  PyBombs.install - ERROR - Error installing package python. Aborting.
  </code></pre>
  
  <p>Pybombs successfully installed a few other packages before reaching this error. I'm not sure how to fix it - I'd appreciate any help.</p>