/usr/lib/x86_64-linux-gnu/pkgconfig/hdf5-mpich.pc is in libhdf5-mpich-dev 1.8.16+docs-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Name: HDF5
Description: Hierarchical Data Format 5 (HDF5) - MPICH version
Version: 1.8.13
Requires: mpich
Cflags: -I/usr/include/hdf5/mpich
Libs: -L/usr/lib/x86_64-linux-gnu/hdf5/mpich -lhdf5
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