/usr/lib/x86_64-linux-gnu/pkgconfig/libuser.pc is in libuser1-dev 1:0.62~dfsg-0.1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libuser
Description: A user and group account administration library.
Version: 0.62
Libs: -L${libdir} -luser
Libs.private: -lcrypt
Requires: glib-2.0 gobject-2.0
Requires.private: gmodule-no-export-2.0
Cflags: -I${includedir}
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