/usr/share/gmt/custom/pacman.def is in gmt-common 5.3.1+dfsg-2.
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 7 | # $Id: pacman.def 12822 2014-01-31 23:39:56Z remko $
#
# Definition file for a pacman symbol.
#
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