The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
The listed file or maintainer script appears to reference
the build path used to build the package as specified in the
Build-Path field of the
This is likely to cause the package to be unreproducible, but it may also indicate that the package will not work correctly outside of the maintainer's own system.
Please note that this tag will not appear unless the
.buildinfo file contains a
Build-Path field. That
field is optional. You may have to set
DEB_BUILD_OPTIONS=buildinfo=+path or use
dpkg-buildpackage when building.
Refer to https://reproducible-builds.org/, https://wiki.debian.org/ReproducibleBuilds/BuildinfoFiles, and the dpkg-genbuildinfo(1) manual page for details.