/usr/lib/x86_64-linux-gnu/pkgconfig/lvtk-gtkui-1.pc is in lvtk-dev 1.2.0~dfsg0-1build1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: lvtk-gtkui
Version: 1.2.0
Description: LV2 Toolkit GtkUI
Requires: lv2 gtkmm-2.4
Libs: -L${libdir} -llvtk_ui1
Cflags: -Wl,-z,nodelete -I${includedir}/lvtk-1
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