/usr/share/pcb/m4/optek.m4 is in pcb-common 20110918-9.
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 | divert(-1)
#
# NOTE: Auto-generated. Do not change.
##
define(`Description_optek_OPTEK_OVSRWACR6', ``OPTEK Surface Mount LED's'')
divert(0)dnl
|