/usr/src/linux-source-4.4.0/debian/source/options is in linux-source-4.4.0 4.4.0-70.91.
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 9 10 11 12 13 14 | # Ignore vbox symlinks, we will regenerate these at clean (LP:1426113)
## autoreconstruct -- begin
# Ignore any symlinks created since the orig which are rebuilt by reconstruct.
extend-diff-ignore=ubuntu/vbox/vboxguest/include
extend-diff-ignore=ubuntu/vbox/vboxguest/r0drv
extend-diff-ignore=ubuntu/vbox/vboxsf/include
extend-diff-ignore=ubuntu/vbox/vboxsf/r0drv
extend-diff-ignore=ubuntu/vbox/vboxvideo/include
extend-diff-ignore=ubuntu/vbox/vboxvideo/r0drv
## autoreconstruct -- end
# force "dpkg-source -I -i" behavior
diff-ignore
tar-ignore
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