Pysundials repository moved
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(cgpenv)-bash-4.1$ pip install svn+https://pysundials.svn.sourceforge.net/svnroot/pysundials/branches/2.3.0/@74
Downloading/unpacking svn+https://pysundials.svn.sourceforge.net/svnroot/pysundials/branches/2.3.0/@74
  Checking out https://pysundials.svn.sourceforge.net/svnroot/pysundials/branches/2.3.0/ (to revision 74) to /tmp/pip-80RzJM-build
svn: Repository moved permanently to 'https://svn.code.sf.net/p/pysundials/code/branches/2.3.0'; please relocate
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As of version 1.5 pip needs to be told to respect dependency links.

https://pip.readthedocs.org/en/latest/news.html
"BACKWARD INCOMPATIBLE pip no longer respects dependency links by
default. Users may opt into respecting them again using
--process-dependency-links."