/usr/lib/x86_64-linux-gnu/pkgconfig/libselinux.pc is in libselinux1-dev 2.6-3+b3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib/x86_64-linux-gnu
includedir=/usr/include
Name: libselinux
Description: SELinux utility library
Version: 2.6
URL: http://userspace.selinuxproject.org/
Requires.private: libsepol libpcre
Libs: -L${libdir} -lselinux
Cflags: -I${includedir}
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