qt opencv编译错误 /usr/local/lib/libopencv_imgcodecs.so.3.1:-1: error: error adding symbols: DSO missing from command line

转载自：http://tbfungeek.github.io/2016/03/05/Opencv-%E5%AE%89%E8%A3%85%E8%BF%87%E7%A8%8B%E4%B8%AD%E5%87%BA%E7%8E%B0%E7%9A%84%E9%94%99%E8%AF%AF/

3.Qt 编写的代码运行时出现类似错误：

/usr/local/lib/libopencv_imgcodecs.so.3.1:-1: error: error adding symbols: DSO missing from command line

这种一般是链接库没有添加：
往项目的pro文件中的动态库链接部分添加报错的库：
如下所示：

INCLUDEPATH += /usr/local/include 
                /usr/local/include/opencv 
                /usr/local/include/opencv2

LIBS += /usr/local/lib/libopencv_highgui.so 
        /usr/local/lib/libopencv_core.so    
        /usr/local/lib/libopencv_imgproc.so 
        /usr/local/lib/libopencv_imgcodecs.so  <------ 这个库没有添加导致的，往这里添加