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The project's API Samples page gives the proper command-line arguments for building and linking against the tesseract_ocr library: "g++ -o myprogram myprogram.cpp -llept -ltesseract"

In cmake, you can link against libraries using target_link_libraries(); cmake will automatically add the -l flag for you, so all you have to do is:

target_link_libraries(my_tesseract_node lept tesseract)