The URL for the tetgen download seems to have changed. OLD: http://tetgen.berlios.de/files/tetgen1.4.3.tar.gz NEW: http://tetgen.org/files/tetgen1.4.3.tar.gz https://bitbucket.org/petsc/petsc/src/master/config/PETSc/packages/tetgen.py?at=master#cl-115 Vijay