Fix compiler errors on gcc 4.2 on Snow Leopard.
Fix compiler errors on gcc 4.2 on Snow Leopard.

qdtk/openshadinglanguage,tectronics/openshadinglanguage,qdtk/openshadinglanguage,h3rb/openshadinglanguage,tectronics/openshadinglanguage,qdtk/openshadinglanguage,tectronics/openshadinglanguage,code-google-com/openshadinglanguage,tectronics/openshadinglanguage,qdtk/openshadinglanguage,code-google-com/openshadinglanguage,h3rb/openshadinglanguage,code-google-com/openshadinglanguage,h3rb/openshadinglanguage,h3rb/openshadinglanguage,code-google-com/openshadinglanguage