libdecodeqr在ubuntu上编译遇到问题的解决方法，解决如下错误

checking for cvCreateImage in -lcv... no

If your system already has OpenCV, append place of the cv.h

libdecodeqr.a(imagereader.o): undefined reference to symbol cvApproxPoly -checking for cvCreateImage in-lcv... no

libdecodeqr in ubuntu

resolve ther errors as follow

If your system already has OpenCV, append place of the cv.h

libdecodeqr.a(imagereader.o): undefined reference to symbol　cvApproxPoly