/usr/src/glibc/debian/debhelper.in/libc-alt.install is in glibc-source 2.23-0ubuntu3.
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 | # This file is used for biarch libraries.
TMPDIR/SLIBDIR/*.so* SLIBDIR
TMPDIR/LIBDIR/gconv/* LIBDIR/gconv/
TMPDIR/etc/ld.so.conf.d /etc
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