On Fedora 28: Devhelp can no longer open the WebKitGTK+ books. Package: webkit2gtk3-doc-2.20.2-1.fc28.noarch $ rpm -ql webkit2gtk3-doc | grep devhelp2 /usr/share/gtk-doc/html/webkit2gtk-4.0/webkit2gtk-4.0/webkit2gtk-4.0.devhelp2 /usr/share/gtk-doc/html/webkitdomgtk-4.0/webkitdomgtk-4.0/webkitdomgtk-4.0.devhelp2 It should be instead: /usr/share/gtk-doc/html/webkit2gtk-4.0/webkit2gtk-4.0.devhelp2 /usr/share/gtk-doc/html/webkitdomgtk-4.0/webkitdomgtk-4.0.devhelp2 Downgrading to webkit2gtk3-doc-2.20.1-1.fc28.noarch fixes the problem.
I guess I read my email in the wrong order. This would have saved me five minutes of confusion.... Anyway, bug #185468. *** This bug has been marked as a duplicate of bug 185468 ***