title: How do I build and install PL/Python against a custom Postgresql (e.g. PG_CONFIG)?
body: <p>I am using PipelineDB, which is a customized, yet compatible fork of Postgresql.  I want to install the plpythonu.control into it to be able to use the PL/Python for user-defined functions.  </p>
  
  <p>I am supposed to "build" the plpythonu extension against the PipelineDB installation, but I cannot find the plpythonu sourcecode nor find any instructions on how to 'make' or 'build' it. Can somebody point me in the right direction to do this?</p>