/usr/src/xtables-addons-2.6/extensions/pknock/Makefile.am is in xtables-addons-dkms 2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # -*- Makefile -*-
AM_CPPFLAGS = ${regular_CPPFLAGS} -I${abs_top_srcdir}/extensions
AM_CFLAGS = ${regular_CFLAGS} ${libxtables_CFLAGS}
include ../../Makefile.extra
noinst_PROGRAMS = pknlusr
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