/usr/lib/x86_64-linux-gnu/pkgconfig/libarchive.pc is in libarchive-dev 3.1.2-7ubuntu2.8.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libarchive
Description: library that can create and read several streaming archive formats
Version: 3.1.2
Cflags: -I${includedir}
Libs: -L${libdir} -larchive
Libs.private: -lnettle -lacl -lattr -llzo2 -llzma -lbz2 -lz -lxml2
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