This package fails to build on an unstable system. Attached relevant logs and emerge --info
Created attachment 747006 [details] emerge_info emerge --info
Created attachment 747009 [details] vtk-9.0.3:20211027-152915.log.xz build log (compressed because it exceeds attachment limit, use 'xzless' to read it)
Proj install no more proj_api.h that's needed by vtk
*** This bug has been marked as a duplicate of bug 820521 ***