fix compile on linux.
fix compile on linux.
manjunathnarayana/libmv,tanmengwen/libmv,pombreda/libmv,Shinohara-Takayuki/libmv,Danath/libmv,manjunathnarayana/libmv,Danath/libmv,manjunathnarayana/libmv,KangKyungSoo/libmv,Danath/libmv,tanmengwen/libmv,Ashwinning/libmv,leoujz/libmv,guivi01/libmv,Shinohara-Takayuki/libmv,tanmengwen/libmv,jackyspeed/libmv,tanmengwen/libmv,leoujz/libmv,Danath/libmv,pombreda/libmv,guivi01/libmv,sanyaade-g2g-repos/libmv,hjm168168/libmv,manjunathnarayana/libmv,KangKyungSoo/libmv,Ashwinning/libmv,leoujz/libmv,Shinohara-Takayuki/libmv,leoujz/libmv,pombreda/libmv,sanyaade-g2g-repos/libmv,Ashwinning/libmv,guivi01/libmv,Shinohara-Takayuki/libmv,sanyaade-g2g-repos/libmv,hjm168168/libmv,Ashwinning/libmv,guivi01/libmv,jackyspeed/libmv,KangKyungSoo/libmv,pombreda/libmv,jackyspeed/libmv,KangKyungSoo/libmv,sanyaade-g2g-repos/libmv,hjm168168/libmv,jackyspeed/libmv,hjm168168/libmv