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Editorial Team
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Asked: 2026-05-29T06:31:13+00:00

i have a file with only import: #include <iostream> #include <stdio.h> #include cxcore.hpp #include

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i have a file with only import:

#include <iostream>
#include <stdio.h>

#include "cxcore.hpp"
#include "highgui.hpp"

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{

}

and i try to compile with g++ -I/usr/include/opencv -lopencv -lm m.cpp

but get whit error:

In file included from /usr/include/opencv/cxcore.hpp:46,
from m.cpp:5:
/usr/include/opencv/cxmisc.h:214: error: expected constructor, destructor, or type conversion before ‘void’
/usr/include/opencv/cxmisc.h:220: error: expected constructor, destructor, or type conversion before ‘int’
/usr/include/opencv/cxmisc.h:226: error: ‘CV_INLINE’ does not name a type
/usr/include/opencv/cxmisc.h:516: error: ‘CV_DEPTH_MAX’ was not declared in this scope
/usr/include/opencv/cxmisc.h:522: error: ‘CV_DEPTH_MAX’ was not declared in this scope
/usr/include/opencv/cxmisc.h:522: error: ‘CV_CN_MAX’ was not declared in this scope
In file included from m.cpp:5:
/usr/include/opencv/cxcore.hpp:70: error: template declaration of ‘cv::CV_EXPORTS cv::Size_’
/usr/include/opencv/cxcore.hpp:71: error: template declaration of ‘cv::CV_EXPORTS cv::Point_’
/usr/include/opencv/cxcore.hpp:72: error: template declaration of ‘cv::CV_EXPORTS cv::Rect_’
/usr/include/opencv/cxcore.hpp:77: error: expected initializer before ‘fromUtf16’
/usr/include/opencv/cxcore.hpp:78: error: expected initializer before ‘toUtf16’
/usr/include/opencv/cxcore.hpp:80: error: expected initializer before ‘format’
/usr/include/opencv/cxcore.hpp:82: error: expected initializer before ‘:’ token
m.cpp:38: error: expected ‘}’ at end of input

this is my copencv lib content:

alberto@zefiro:~$ ls /usr/include/opencv/
cvaux.h    cvcompat.h  cv.hpp        cvtypes.h  cvvidsurv.hpp  cxcore.h    cxerror.h  cxmat.hpp  cxoperations.hpp  highgui.h    ml.h
cvaux.hpp  cv.h        cvinternal.h  cvver.h    cvwimage.h     cxcore.hpp  cxflann.h  cxmisc.h   cxtypes.h         highgui.hpp

i’m on ubuntu 10.10

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1 Answer

  1. Editorial Team

    You need to properly include the headers -I (capital i) and libraries -l (lowercase L).

    On the newest OpenCV versions you should do:

    #include <cv.h>
#include <highgui.h>

    And then try to compile it with:

    g++ m.cpp -o app `pkg-config --cflags --libs opencv`

    Note: if you execute only pkg-config --cflags --libs opencv in the command line you will see the paths and libraries you need to include in the g++ command line.

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