On amd64 10.2-release, using exlusively pkg I get this: # pkg check -d taucs Checking taucs: 100% taucs has a missing dependency: metis4 >>> Missing package dependencies were detected. >>> Found 1 issue(s) in the package database. pkg: No packages available to install matching 'metis4' have been found in the repositories >>> Summary of actions performed: metis4 dependency failed to be fixed >>> There are still missing dependencies. >>> You are advised to try fixing them manually. >>> Also make sure to check 'pkg updating' for known issues.
This works as indented: metis4 can't be redistributed so there's no package for it.