Fixing OpenCV 2.1.0 compile errors

I have faced this problem every time I installed opencv 2.1.0. During building the makefile, some errors appear as follows and build terminates:

../../lib/libhighgui.so.2.1.0: undefined reference to `cvCreateCameraCapture_V4L(int)‘
collect2: ld returned 1 exit status
make[3]: *** [bin/opencv_createsamples] Error 1

Following files need to be changed to build successfully without any error.

OpenCV.2.1.0/cvconfig.h.cmake
OpenCV.2.1.0/src/highgui/cvcap.cpp
OpenCV.2.1.0/src/highgui/cvcap_libv4l.cpp

OpenCV.2.1.0/cvconfig.h.cmake

Search for these lines in the file

#cmakedefine HAVE_CAMV4L2

Add following lines after above line

/* V4L/V4L2 capturing support via libv4l */

#cmakedefine HAVE_LIBV4L

OpenCV.2.1.0/src/highgui/cvcap.cpp

Delete or comment the following line

#if defined (HAVE_CAMV4L) || defined (HAVE_CAMV4L2)

Replace with following expression

#if defined HAVE_LIBV4L || (defined (HAVE_CAMV4L) && defined (HAVE_CAMV4L2))

OpenCV.2.1.0/src/highgui/cvcap_libv4l.cpp

Replace

#if !defined WIN32 && defined HAVE_CAMV4L

with

#if !defined WIN32 && defined HAVE_LIBV4L

Search for

#include <linux/videodev.h>

Add #ifdef HAVE_CAMV4L just before it and #endif just after it.

Again Search for #include <linux/videodev2.h>

Add #ifdef HAVE_CAMV4L2 just before it and #endif just after it.

Reference: http://akashashwat.net23.net/?p=8