神秘的"undefined reference"链接器错误

对于一个大学项目，我正在为Android做一个手跟踪算法端口。代数。主要使用OpenCV函数。老实说，我真的不明白代数是什么。是的，但这不是我的问题。所以移植alg。我把一个正在工作的windows visual studio项目中的每个文件都添加到了我的android项目中，修复了一些编译器警告和错误。主要是成功。。。不幸的是，有一个文件让我担心了好几个小时。编译此文件会引发以下错误：

./obj/local/armeabi-v7a/libopencv_legacy.a(compat.o): In function `cvFindChessBoardCornerGuesses':
compat.cpp:(.text.cvFindChessBoardCornerGuesses+0x18): undefined reference to `cvFindChessboardCorners'
./obj/local/armeabi-v7a/libopencv_legacy.a(compat.o): In function `cvHoughLines':
compat.cpp:(.text.cvHoughLines+0x46): undefined reference to `cvHoughLines2'
./obj/local/armeabi-v7a/libopencv_legacy.a(compat.o): In function `cvHoughLinesSDiv':
compat.cpp:(.text.cvHoughLinesSDiv+0x54): undefined reference to `cvHoughLines2'
./obj/local/armeabi-v7a/libopencv_legacy.a(compat.o): In function `cvHoughLinesP':
compat.cpp:(.text.cvHoughLinesP+0x52): undefined reference to `cvHoughLines2'
./obj/local/armeabi-v7a/libopencv_legacy.a(compat.o): In function `cvCalcEMD':
compat.cpp:(.text.cvCalcEMD+0x44): undefined reference to `cvCalcEMD2'
collect2: ld returned 1 exit status

有趣的是，唯一导致这个错误的线路是

nPointsConnected ++;

注释此行或减少nPointsConnected或设置类似nPointsCoonnected=1的值会使链接器错误消失。

项目中还有其他文件，包括相同的OpenCV头文件，正在编译。有人能向我解释一下吗？请

编辑这是环绕码：

 if ( minK > FINGERTIP_ANGLE_THRESHOLD && minDir > 0 )
    {
        nPointsGap = 0;
        if ( nPointsConnected == 0 )
            {
                startIndex = i;
            }
        nPointsConnected ++;
        if ( minAngle < minK )
        {
            minAngle = minK;
            minPointIndex = i;
        }
        fConnected = true;
        mediumIndex += ( minK * i );
        meanPointX += ( minK * contour[i].x );
        meanPointY += ( minK * contour[i].y );
        sumAngle += minK;
        if ( fScreenshot )
        {
            cvCircle( pScreenshot_curvature, cvPoint(contour[i].x*2, contour[i].y*2),
                4, CV_RGB(255,255,0), -1, 8, 0 );
            cvCircle( pScreenshot_ellipse, cvPoint(contour[i].x*2, contour[i].y*2),
                4, CV_RGB(255,255,0), -1, 8, 0 );
        }
    }