Link tesseract libs with QtCreator

I'm trying to run a C++ program which is based on tesseract API and I'm using QtCreator as IDE on Ubuntu, in order to perfom page layout analysis :

int main(void)
{
int left, top, right, bottom;

tesseract::TessBaseAPI tessApi;
tessApi.InitForAnalysePage();

cv::Mat img = cv::imread("document.png");
tessApi.SetImage(reinterpret_cast<const uchar*>(img.data), img.size().width, img.size().height, img.channels(), img.step1());

tesseract::PageIterator *iter = tessApi.AnalyseLayout();

while (iter->Next(tesseract::RIL_BLOCK))
    iter->BoundingBox( tesseract::RIL_BLOCK, &left, &top, &right, &bottom);

return EXIT_SUCCESS;
}

But in turn I got these kind of errors confirming that tesseract and Qt aren't linked :

main.cpp:11: error: undefined reference to `tesseract::TessBaseAPI::TessBaseAPI()'
main.cpp:12: error: undefined reference to `tesseract::TessBaseAPI::InitForAnalysePage()'
main.cpp:16: error: undefined reference to `tesseract::TessBaseAPI::SetImage(unsigned char const*, int, int, int, int)'
main.cpp:18: error: undefined reference to `tesseract::TessBaseAPI::AnalyseLayout()'

Here is my .pro file :

INCLUDEPATH += /usr/local/include/opencv \
           /usr/include/tesseract

LIBS += -L"/usr/local/opencv/lib"   -lopencv_calib3d \
                                -lopencv_contrib \
                                -lopencv_core \
                                -lopencv_features2d \
                                -lopencv_flann \
                                -lopencv_gpu \
                                -lopencv_highgui \
                                -lopencv_imgproc \
                                -lopencv_legacy \
                                -lopencv_ml \
                                -lopencv_nonfree \
                                -lopencv_objdetect \
                                -lopencv_ocl \
                                -lopencv_photo \
                                -lopencv_stitching \
                                -lopencv_superres \
                                -lopencv_video \
                                -lopencv_videostab

LIBS += -L"/usr/bin/tesseract"

You only have the path for the lib -L"/usr/bin/tesseract", you forgot to include the lib as well. Just add it like you did for the openCV libs.