/usr/include/ is in libjavascriptcoregtk-1.0-dev 1.8.0-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/webkitgtk-1.0/
/usr/include/webkitgtk-1.0/JavaScriptCore/
/usr/include/webkitgtk-1.0/JavaScriptCore/JSBase.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JSContextRef.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JSObjectRef.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JSStringRef.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JSStringRefBSTR.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JSStringRefCF.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JSValueRef.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JavaScript.h
/usr/include/webkitgtk-1.0/JavaScriptCore/JavaScriptCore.h
/usr/include/webkitgtk-1.0/JavaScriptCore/WebKitAvailability.h