/usr/lib/pkgconfig/javascriptcoregtk-1.0.pc is in libjavascriptcoregtk-1.0-dev 1.8.3-0ubuntu0.12.04.1.
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
includedir=${prefix}/include
Name: JavaScriptCoreGTK+
Description: GTK+ version of the JavaScriptCore engine
Version: 1.8.3
Requires: glib-2.0
Libs: -L${libdir} -ljavascriptcoregtk-1.0
Cflags: -I${includedir}/webkitgtk-1.0
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