This file is indexed.

/usr/include/tcgmsg.fh is in libga-dev 5.3+dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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      double precision tcgtime
      integer nodeid, nnodes, mitob, mdtob, nxtval
      external nodeid, nnodes, mitob, mdtob, nxtval
      external tcgtime