The library(janus) allows embedding Python into Prolog. The package source is in packages/swipy. This directory can also be compiled as a Python package to embed SWI-Prolog into Python, providing the Python package janus_swi.

Consequences

The library is not used by any of the other system components and is thus only necessary if your application requires it.

Solutions

When building from source, the library requires the Python embedding libraries. On Debian Linux systems these are provided by

sudo  apt-get install python3 libpython3-dev

On MacOS and Windows the libraries and header files are provided as part of the Python installer.

See also

- https://github.com/SWI-Prolog/packages-swipy