Can't use old c functions in opencv 3.1 -

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opencv3.1 build cmake latest stable. trying cpp example project works fine.

i tried hello-world example from:

http://www.cs.iit.edu/~agam/cs512/lect-notes/opencv-intro/opencv-intro.html

test.c

//////////////////////////////////////////////////////////////////////// // // hello-world // // simple, introductory opencv program. program reads // image file, inverts it, , displays result.  // //////////////////////////////////////////////////////////////////////// #include <stdlib.h> #include <stdio.h> #include <math.h> #include <cv.h> #include <highgui.h>   int main(int argc, char *argv[]) {   iplimage* img = 0;    int height,width,step,channels;   uchar *data;   int i,j,k;    if(argc<2){     printf("usage: main <image-file-name>\n\7");     exit(0);   }    // load image     img=cvloadimage(argv[1]);   if(!img){     printf("could not load image file: %s\n",argv[1]);     exit(0);   }    // image data   height    = img->height;   width     = img->width;   step      = img->widthstep;   channels  = img->nchannels;   data      = (uchar *)img->imagedata;   printf("processing %dx%d image %d channels\n",height,width,channels);     // create window   cvnamedwindow("mainwin", cv_window_autosize);    cvmovewindow("mainwin", 100, 100);    // invert image   for(i=0;i<height;i++) for(j=0;j<width;j++) for(k=0;k<channels;k++)     data[i*step+j*channels+k]=255-data[i*step+j*channels+k];    // show image   cvshowimage("mainwin", img );    // wait key   cvwaitkey(0);    // release image   cvreleaseimage(&img );   return 0; }

when copying source code local *.c file, following errors, while compiling:

gcc `pkg-config --cflags opencv` -wall -o2 `pkg-config --libs opencv` -lm -o test test.c /tmp/ccyrzo8f.o: in funktion `main': test.c:(.text.startup+0x32): nicht definierter verweis auf `cvloadimage' test.c:(.text.startup+0x78): nicht definierter verweis auf `cvnamedwindow' test.c:(.text.startup+0x89): nicht definierter verweis auf `cvmovewindow' test.c:(.text.startup+0xed): nicht definierter verweis auf `cvshowimage' test.c:(.text.startup+0xf9): nicht definierter verweis auf `cvwaitkey' test.c:(.text.startup+0x104): nicht definierter verweis auf `cvreleaseimage' collect2: error: ld returned 1 exit status make: *** [prog] fehler 1

how can work?


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