/usr/lib/x86_64-linux-gnu/pkgconfig/libp11.pc is in libp11-dev 0.2.8-3ubuntu1.
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=${prefix}/include
Name: libp11
Description: libp11
Version: 0.2.8
Libs: -L${libdir} -lp11
Libs.private: -lcrypto
Cflags: -I${includedir}
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