/usr/lib/x86_64-linux-gnu/pkgconfig/webkitgtk-3.0.pc is in libwebkitgtk-3.0-dev 2.4.11-3ubuntu3.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: WebKit
Description: Web content engine for GTK+
Version: 2.4.11
Requires: glib-2.0 gtk+-3.0 libsoup-2.4 javascriptcoregtk-3.0
Libs: -L${libdir} -lwebkitgtk-3.0
Cflags: -I${includedir}/webkitgtk-3.0
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