/usr/lib/x86_64-linux-gnu/pkgconfig/u2f-server.pc is in libu2f-server-dev 1.0.1-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Libu2f-server
Description: Yubico Universal 2nd Factor (U2F) Server C Library
URL: https://www.yubico.com/
Version: 1.0.1
Libs: -L${libdir} -lu2f-server
Cflags: -I${includedir}/u2f-server
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