fixing compile problem with older versions of boost
fixing compile problem with older versions of boost


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