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 | |
|---|---|---|
| 214 | 214 | #include <sys/types.h> |
| 215 | 215 | #include <sys/mman.h> |
| 216 | 216 | |
| 217 | #ifdef HAVE_CAMV4L //我们自己加上去 | |
| 217 | 218 | #include <linux/videodev.h> |
| 219 | #endif //我们自己加上去 | |
| 218 | 220 | |
| 219 | 221 | #include <string.h> |
| 220 | 222 | #include <stdlib.h> |
下载的源代码里面找到OpenCV-2.2.0/modules/highgui/src/cap.cpp
| old | new | |
|---|---|---|
| 171 | 171 | if (capture) |
| 172 | 172 | return capture; |
| 173 | 173 | #endif |
| 174 | //把本行后面的删掉，就变成本行下面的一行#if defined (HAVE_CAMV4L) |
|
| 174 | #if defined (HAVE_CAMV4L) | |
| 175 | 175 | capture = cvCreateCameraCapture_V4L (index); |
| 176 | 176 | if (capture) |
| 177 | 177 | 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