/usr/include/trilinos/MueLu_AggregationPhase2aAlgorithm.hpp is in libtrilinos-muelu-dev 12.10.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | #include "MueLu_AggregationPhase2aAlgorithm_decl.hpp"
|