2 header locations are needed ?

[pedro-vicente]

to include in a cmake project, it seems 2 header locations are needed ?

include_directories(nonius-1.1.2/include/nonius)
include_directories(nonius-1.1.2/include)

[granthusbands]

There's a single-header version in the main zips on the releases page here:
https://github.com/libnonius/nonius/releases/

(It's different to the releases page linked to in the readme. I'm not affiliated with this project.)