In the webkitgtk 1.1.6 build setup Programs/GtkLauncher is just libtool-produced shell script because its a noinst target. The actual binary is in Programs/.libs/ -install -m 755 Programs/GtkLauncher %{buildroot}%{_libexecdir}/%{name} +install -m 755 Programs/.libs/GtkLauncher %{buildroot}%{_libexecdir}/%{name} should work.
*** This bug has been marked as a duplicate of bug 443048 ***