docs/docs/reference/meson.build:47: DEPRECATION: Setting a configuration data value to None is invalid, and will fail at configure_file(). If you are using it just to store some values, please use a dict instead.
Configuring Doxyfile using configuration

docs/docs/reference/meson.build:49:0: ERROR: Tried to replace variable 'PERL' value with something other than a string or int: None