I want to compile the following OpenCV programm with CodeBlocks or with Linux Terminal.

<http://plaza.ufl.edu/tyler727/imdl/src/eigenface.cpp>

```
    line 57:   nTrainFaces = loadFaceImgArray("/home/hacker/data/Eigenfacecpp/train.txt");

    line 192: // load test images and ground truth for person number
             nTestFaces = loadFaceImgArray("/home/hacker/data/Eigenfacecpp/test.txt");

    // project the training images onto the PCA subspace
    projectedTrainFaceMat = cvCreateMat(nTrainFaces, nEigens, CV_32FC1);
    for(i=0; i<nTrainFaces; i++)
    {
        cvEigenDecomposite(faceImgArr[i],
                           nEigens,
                           eigenVectArr,
                           0, 0,
                           pAvgTrainImg,
line 78:                    projectedTrainFaceMat->data.fl + i*nEigens);
    }

     cvCalcEigenObjects(nTrainFaces,
                        (void*)faceImgArr,
                        (void*)eigenVectArr,
                        CV_EIGOBJ_NO_CALLBACK,
                        0,
                        0,
                        &calcLimit,
                        pAvgTrainImg,
line 154:                eigenValMat->data.fl);

        //project the test image onto the PCA subspace
        cvEigenDecomposite(faceImgArr[i],
                           nEigens,
                           eigenVectArr,
                           0, 0,
                           pAvgTrainImg,
line 211:                   projectedTestFace);

```

And i got those errors:

```
Compiling: eigenface.cpp

In Function »void learn()«:
line 57:  deprecated conversion from string constant to ‘char*’ [Wwrite-strings]

In Function »double recognize()«:
line 192: deprecated conversion from string constant to ‘char*’ [Wwrite-strings]

/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
obj/Debug/eigenface.o: In function `learn()':
/home/hacker/data/Eigenfacecpp/eigenface.cpp:78: undefined reference to `cvEigenDecomposite'

obj/Debug/eigenface.o: In function `doPCA()':
/home/hacker/data/Eigenfacecpp/eigenface.cpp:154: undefined reference to `cvCalcEigenObjects'

obj/Debug/eigenface.o: In function `recognize()':
/home/hacker/data/Eigenfacecpp/eigenface.cpp:211: undefined reference to `cvEigenDecomposite'

```

I don't understand what I did wrong. I think it's something stupid but I can't find it.

Compiler and Debugger Settings from CodeBlocks:

Linker Settings->Other Options: `-lopencv_core -lopencv_objdetect -lopencv_imgproc` -lopencv\_highgui

Search Directories->Compiler: `/usr/local/include/opencv`
Search Directories->Linker: `/usr/lib`

What have I done wrong here?
Please help me with this problem.