fedora 15 安装opencv2.2时出现undefined reference to `cvCreateCameraCapture_V4L(int)'问题及其解决方法

在Fedora 15 下编译OpenCV 2.2

      进行到7%左右时出现"ptrdeff_t"未定义都错误，考虑到之前在Fedora 14下编译没问题，可能是内核升级后头文件包含出现变动，所以才没有包含进stddef.h头文件。找到出错文件，就我的情况而言是：OpenCV-2.2.0/modules/core/include/opencv2/core/core.hpp
   在该文件的合适位置加上语句：

#include<stddef.h>

继续编译，到81%左右出现了undefined reference to `cvCreateCameraCapture_V4L(int)'错误.

参考 https://code.ros.org/trac/opencv/ticket/324

In some linux distros where V4L2 is enabled, CMake does not define the HAVE_CAMV4L macro, but the macro HAVE_CAMV4L2 is defined.
When the highgui.so is building and linked with an other program, a Link error undefined reference to cvCreateCameraCapture_V4L is detected, and the library is not finished. The compilation terminated at [ 83%] Building. 

解决方法（推荐使用第二种方法）：

下载的源代码里面找到OpenCV-2.2.0/modules/highgui/src/cap_v4l.cpp

old new   214214#include <sys/types.h>  215215#include <sys/mman.h>  216216   217#ifdef HAVE_CAMV4L //我们自己加上去 217218#include <linux/videodev.h>   219#endif //我们自己加上去 218220  219221#include <string.h>  220222#include <stdlib.h> 

下载的源代码里面找到OpenCV-2.2.0/modules/highgui/src/cap.cpp

old new   171171            if (capture)  172172                return capture;  173173        #endif  174         //把本行后面的删掉，就变成本行下面的一行#if defined (HAVE_CAMV4L) || defined (HAVE_CAMV4L2)   174        #if defined (HAVE_CAMV4L)  175175            capture = cvCreateCameraCapture_V4L (index);  176176            if (capture)  177177                return capture; 

实际上就是修改第174行。

参考文献

http://blog.csdn.net/moc062066/article/details/6616902

https://code.ros.org/trac/opencv/ticket/324

http://www.eefocus.com/DSP_geek/blog/10-12/200665_09816.html