/usr/src/dahdi-2.10.2~dfsg-1ubuntu1/include/dahdi/Kbuild is in dahdi-dkms 1:2.10.2~dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | header-y += kernel.h
header-y += user.h
header-y += wctdm_user.h
header-y += version.h
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