/usr/lib/x86_64-linux-gnu/pkgconfig/lv2dynparamplugin1.pc is in liblv2dynparam1-dev 2-5.
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=${prefix}/include/lv2dynparam1
Name: lv2dynparamplugin1
Version: 2
Description: Convenience library for plugins to support LV2 dynparam extension (v1)
Libs: -L${libdir} -llv2dynparamplugin1
Cflags: -I${includedir}
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