can't import Cairo

[fredzannarbor]

(unity) fred@Freds-MacBook-Pro:~/unity/FantasyMapGenerator/build$ ./map_generation
Error: module import
Traceback (most recent call last):
  File "/Users/fred/bin/nimble/unity/FantasyMapGenerator/build/render/rendermap.py", line 2, in <module>
    import cairo

Python 3.8.5
(unity) fred@Freds-MacBook-Pro:~/unity/FantasyMapGenerator/build$ pip freeze | grep cairo
cairocffi==1.3.0
pycairo==1.21.0

[Andonome]

Is cairo outdated? I can't get this working on Linux.