/usr/lib/x86_64-linux-gnu/pkgconfig/opendht.pc is in libopendht-dev 1.2.1~dfsg1-8.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: OpenDHT
Description: C++ Distributed Hash Table library
Version: 1.2.1
Libs: -L${libdir} -lopendht -lnettle -lgnutls -largon2
Libs.private: -lpthread
Requires.private: gnutls >= 3.1
Cflags: -I${includedir}
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