This is discussed upstream here: https://github.com/breathe-doc/breathe/issues/935
It appears to be a regression in doxygen caused by: https://github.com/doxygen/doxygen/commit/a18e4c76ed6415893800c7d77a2f798614fb638b Best regards, Dale Richards
- Bug#1051166: FTBFS with doxygen 1.9.8 Dale Richards
