/usr/lib/pkgconfig/npgsql.pc is in libnpgsql-cil-dev 2.2.7+dfsg3-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
Name: Npgsql
Description: Npgsql - PostgreSQL connector for CLI
Version: 2.2.7
Libs: -r:${libdir}/cli/Npgsql-2.2/Npgsql.dll
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