https://bugs.freedesktop.org/show_bug.cgi?id=105426
--- Comment #5 from Józef Kucia joseph.kucia@gmail.com --- error: declarations for shader output `gl_BackSecondaryColor` are in gl_PerVertex and gl_PerVertex
It looks like the same problem as bug 104668 and bug 104777.
4195eed961ccfe404ae81b9112189fc93a254ded fixes the problem.