/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.
1 2 3 4 | double precision tcgtime
integer nodeid, nnodes, mitob, mdtob, nxtval
external nodeid, nnodes, mitob, mdtob, nxtval
external tcgtime
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