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Installing Agda
I added these lines to my configuration.nixos to get a workable Agda installation:
(agda.withPackages (p: [ p.standard-library ]))
but there were a few issues, so I removed that and installed with cabal update cabal install Agda which seemed to work nicely after some hackery with zlib, and installing the standard libraries.
Owen's Geolog definitions
Owen.agda : Definitions fom Owen's first two lectures about Geolog.
These set up the basic machinery for contexts (signatures), theories and interpolation.
Compile with: agda -c --no-main Owen.agda
HoTT definitions from Martin Escardo's book "Univalent Foundations" https://arxiv.org/pdf/1911.00580
agda -c --no-main MLTT/Universe.agda
Escardo defines everything from the ground up with his own concepts of sets, universes etc., independently of the standard library.
Got as far as the definition of 𝟙-induction for a single-valued type 𝟙. The sources (in more consistent versions than in the notes) are here: https://github.com/martinescardo/HoTT-UF-Agda-Lecture-Notes