/usr/lib/x86_64-linux-gnu/pkgconfig/vamp.pc is in vamp-plugin-sdk 2.6~repack0-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: vamp
Version: 2.5
Description: An API for audio analysis and feature extraction plugins
Libs:
Cflags: -I${includedir}
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