Hi @thinman,
AUR is neither recommended, nor supported.By neither Arch or Manjaro.
I think this tells you what’s wrong:
Some searching led me to this, which led me to this:
And I discovered it’s in the extra
repository:
$ pamac search nlohmann
[...]
nlohmann-json 3.11.2-1 extra
JSON for Modern C++
So, it can be easily installed with this:
pamac install nlohmann-json
Followed by trying to install ifcopenshell again:
pamac build ifcopenshell
Hope this helps!