... LNK2019: unresolved external symbol "struct cv::Ptr<class cv::ximgproc::FastLineDetector> __cdecl cv::ximgproc::createFastLineDetector(int,float,double,double,int,bool)" (?createFastLineDetector@ximgproc@cv@@YA?AU?$Ptr@VFastLineDetector@ximgproc@cv@@@2@HMNNH_N@Z) referenced in ...