/usr/src/gcc-6/debian/lib64gphobos68.lintian-overrides is in gcc-6-source 6.4.0-17ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # no usable zconf.h header in lib64z1-dev
lib64gphobos68 binary: embedded-library
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