/usr/lib/x86_64-linux-gnu/pkgconfig/libduo.pc is in libduo-dev 1.7-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libduo
Description: Duo two-factor authentication for Unix systems
Version: 1.7
Requires: openssl
Libs: -L${libdir} -lduo -lssl -lcrypto
Cflags: -I${includedir}
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