Starting with psycopg2 version 2.8, the package on pypi no longer
contains a binary version and must be compiled from source. These two
packages are required for this to be possible.
It would have been simpler to just switch to the psycopg2-binary
package, however that isn't a very good solution overall since many
other packages treat "psycopg2" as the dependency that they want
installed, not "psycopg2-binary". Overall, this situation is pretty
messy and I'm not sure what will end up being the final state, but this
should work for now.
More info about the source-only change:
http://initd.org/psycopg/articles/2018/02/08/psycopg-274-released/
Previously I was using pyenv to build Python, but that's mostly
unnecessary and has some other side effects (like needing to install a
lot of packages as dependencies).
This switches to using the deadsnakes PPA instead, which also has the
effect of upgrading to the most recent version of Python 3.6 (currently,
3.6.7 instead of 3.6.5).
Deimos