'error: ‘TessBaseAPI’ has not been declared' is thrown many times in the make listing. .configure output: ./configure -- Source: /home/fritz/Downloads/VobSub2SRT -- Binary: /home/fritz/Downloads/VobSub2SRT/build -- Build type: Debug CMake Warning at CMakeModules/FindTesseract.cmake:56 (message): You are using an old Tesseract version. Support for Tesseract 2 is deprecated and will be removed in the future! Call Stack (most recent call first): CMakeLists.txt:66 (find_package) -- Bash completion path: /usr/share/bash-completion/completions -- vobsub2srt version: 1.0pre7-11-g0ba6e25-dirty -- Debian architecture: amd64 -- Configuring done -- Generating done -- Build files have been written to: /home/fritz/Downloads/VobSub2SRT/build