Fix for correct compile on Linux.
Fix for correct compile on Linux.

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