This package fails to build on an unstable system. Attached relevant logs and emerge --info
Created attachment 716772 [details] emerge_info emerge --info
Created attachment 716775 [details] qu-prolog-10.6:20210619-002620.log build log
This is because you're setting -D_GLIBCXX_ASSERTIONS
I suspect there was/is something more going on here, like setting CPPFLAGS overriding something else in build system instead of appending.
(In reply to Sam James from comment #4) > I suspect there was/is something more going on here, like setting CPPFLAGS > overriding something else in build system instead of appending. Can't reproduce.