This package fails to compile on an unstable system. Attached relevant logs and emerge --info
Created attachment 709179 [details] emerge_info emerge --info
Created attachment 709182 [details] pcl-1.11.1:20210516-181155.log.xz build log (compressed because it exceeds attachment limit, use 'xzless' to read it)
Alessandro, this should be solved with 1.12.1-r1, which depends on sphinxcontrib-doxylink. Can you confirm this is still present in 1.12.1? If not, please consider closing the bug as obsolete.