/usr/lib/x86_64-linux-gnu/pkgconfig/wimlib.pc is in libwim-dev 1.12.0-1build1.
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=${prefix}/include
Name: wimlib
Description: Library to extract, create, modify, and mount Windows Imaging (WIM) files
URL: https://wimlib.net
Version: 1.12.0
Libs: -L${libdir} -lwim
Requires.private: libxml-2.0 libntfs-3g fuse
Libs.private: -lrt
Cflags: -I${includedir}
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