/usr/lib/pkgconfig/virtuoso-5.5.pc is in libvirtuoso5.5-cil 6.1.6+repack-0ubuntu5.
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=${prefix}
libdir=${prefix}/lib/cli/virtuoso-5.5
Name: OpenLink.Data
Description: Virtuoso .NET Data Connector
Version: 5.5.3015.1
Libs: -r:${libdir}/OpenLink.Data.Virtuoso.dll
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