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I am new to Linux programming, I am trying create an OCR application on Ubuntu 12.10 using Tesseract and OpenCV. So far I have setup tesseract and OpenCV on linux also I have followed this tutorial, in this tutorial I found it very easy that we create one file CMakeList.txt and link OpenCV in it.

Now I am trying to compile tesseract-ocr library with this code. As I know I did not make a link between tesseract-ocr and my code and thats why I am having errors.

All I want and searching for is if I can link Tesseract and OpenCV using CMake in one file, if it is possible. A tutorial would be good as I am totally new to Linux. Thanks in advance

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I wrote a CMakeLists.txt like this

cmake_minimum_required (VERSION 2.6)
project (test-ocr)

# Add the including directory of the tesseract 
# and please replace with your dir.
include_directories (/home/ytxie/include)
# Add the search directory for the tesseract library 
# and please replace with your dir.
link_directories (/home/ytxie/lib)

add_executable (test-ocr test.cpp)

# link the leptonica library and the tesseract library
target_link_libraries (test-ocr lept tesseract)

I've add comments and it seems easy to understand. The test.cpp is just the that example code.

And if you want to add OpenCV relating setting into this cmake file, just add them. If there are some confusing things please read the CMake's document.

NOTE: to make the test-ocr run successfully, you should download the English data and copy it's content into the /share/tessdata.

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Appreciate your answer, I have two questions. Do I need to include and link directories for both "tesseract" and "lept" ? I am trying to find libraries using command pkg-config --cflags tesseract and pkg-config --cflags lept and it is throwing me errors. I dont know where exactly these libraries are as I have installed them many times
@MuhammadMaaz There are linking search directories defined by ldconfig and you can Google it to find more information. In my computer, lept is installed on the /usr/lib which is within the search set defined by ldconfig so I didn't add it specifically. But I installed tesseract in my home directory which is not in the search set mentioned above and I must tell CMake how to find this library.
@MuhammadMaaz I'm sorry I don't know why pkg-config --cflags lept return error. pkg-config find information of a library by finding it's corresponding pc file in directories such as /usr/lib/pkgconfig and /usr/local/lib/pkgconfig etc.. But I don't know why there's not a liblept.pc file.

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