Tesseract (master) installation by using git-bash (version>=2.14.1) and cmake (version >=3.9.1)

1. We assume you installed opencv and opencv_contrib in c:/lib using [this tutorials](http://docs.opencv.org/master/d3/d52/tutorial_windows_install.html#tutorial_windows_gitbash_build]
2. You must download png lib and zlib. Uncompress lpngx.y.zz in folder lpng and zlib in folder zlib. lpng and zlib must be in same folder as opencv and opencv_contrib. save this script with name installpngzlib.sh in c:/lib

   #!/bin/bash
   myRepo=$(pwd)
   CMAKE_CONFIG_GENERATOR="Visual Studio 14 2015 Win64"
   RepoSource=zlib
   mkdir Build/$RepoSource
   pushd Build/$RepoSource
   cmake . -G"Visual Studio 14 2015 Win64" \
   -DCMAKE_INSTALL_PREFIX:PATH="$myRepo"/install/zlib -DINSTALL_BIN_DIR:PATH="$myRepo"/install/zlib/bin \
   -DINSTALL_INC_DIR:PATH="$myRepo"/install/zlib/include -DINSTALL_LIB_DIR:PATH="$myRepo"/install/zlib/lib "$myRepo"/"$RepoSource"
   cmake --build . --config release
   cmake --build . --target install --config release
   cmake --build . --config debug
   cmake --build . --target install --config debug
   popd
   RepoSource=lpng
   mkdir Build/$RepoSource
   pushd Build/$RepoSource
   cp "$myRepo"/"$RepoSource"/scripts/pnglibconf.h.prebuilt "$myRepo"/"$RepoSource"/pnglibconf.h
   cmake . -G"Visual Studio 14 2015 Win64" \
   -DZLIB_INCLUDE_DIR:PATH="$myRepo"/install/zlib/include -DZLIB_LIBRARY_DEBUG:FILE="$myRepo"/install/zlib/lib/zlibstaticd.lib \
   -Dld-version-script:BOOL=OFF -DPNG_TESTS:BOOL=OFF -DAWK:STRING= \
   -DZLIB_LIBRARY_RELEASE:FILE="$myRepo"/install/zlib/lib/zlibstatic.lib -DCMAKE_INSTALL_PREFIX="$myRepo"/Install/"$RepoSource" \
   "$myRepo"/"$RepoSource"
   cmake --build . --config release
   cmake --build . --target install --config release
   cmake --build . --config debug
   cmake --build . --target install --config debug
   popd

3. In git command line enter the following command :

   ./installpngzlib.sh

4. save this script with name installTesseract.sh in c:/lib

   #!/bin/bash
   function MAJGitRepo
   {
   if [  ! -d "$myRepo/$1"  ]; then
     echo "clonning ${1}"
     git clone $2
     mkdir Build/$1
   else
     echo "update $1"
     cd $1
     git pull --rebase
     cd ..
   fi
   }
   echo "Installing leptonica and tesseract"
   myRepo=$(pwd)
   CMAKE_CONFIG_GENERATOR="Visual Studio 14 2015 Win64"
    
   MAJGitRepo leptonica https://github.com/DanBloomberg/leptonica.git
   RepoSource=leptonica
   pushd Build/$RepoSource
   cmake -G"$CMAKE_CONFIG_GENERATOR" -DCMAKE_INSTALL_PREFIX="$myRepo"/Install/leptonica "$myRepo/$RepoSource"
   echo "************************* $Source_DIR -->debug"
   cmake --build .  --config release
   cmake --build $RepoSource  --target install --config release
   popd
    
   RepoSource=tesseract
   MAJGitRepo $RepoSource https://github.com/tesseract-ocr/tesseract.git
   pushd Build/$RepoSource
   cmake -G"$CMAKE_CONFIG_GENERATOR"  -DBUILD_TRAINING_TOOLS:BOOL=OFF -DCMAKE_INSTALL_PREFIX="$myRepo"/Install/tesseract -DLeptonica_DIR:PATH="$myRepo"/Install/leptonica/cmake -DPKG_CONFIG_EXECUTABLE:BOOL=OFF "$myRepo"/"$RepoSource"
   echo "************************* $Source_DIR -->release"
   cmake --build . --config release
   cmake --build .  --target install --config release
    
   popd
   RepoSource=opencv
   pushd Build/$RepoSource
   CMAKE_OPTIONS='-DBUILD_PERF_TESTS:BOOL=OFF -DBUILD_TESTS:BOOL=OFF -DBUILD_DOCS:BOOL=OFF -DWITH_CUDA:BOOL=OFF'
   cmake -G"$CMAKE_CONFIG_GENERATOR"  \
   -DTesseract_INCLUDE_DIR:PATH="${myRepo}"/Install/tesseract/include -DTesseract_LIBRARY="${myRepo}"/Install/tesseract/lib/tesseract400.lib -DLept_LIBRARY="${myRepo}"/Install/leptonica/lib/leptonica-1.74.4.lib \
   $CMAKE_OPTIONS -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
   -DINSTALL_CREATE_DISTRIB=ON -DCMAKE_INSTALL_PREFIX="$myRepo"/install/"$RepoSource"  "$myRepo/$RepoSource"
   echo "************************* $Source_DIR -->devenv debug"
   cmake --build .  --config debug
   echo "************************* $Source_DIR -->devenv release"
   cmake --build .  --config release
   cmake --build .  --target install --config release
   cmake --build .  --target install --config debug
   popd

   In this script I suppose you use VS 2015 in 64 bits

   CMAKE_CONFIG_GENERATOR="Visual Studio 14 2015 Win64"

   and leptonica, tesseract will be installed in c:/lib/install

   -DCMAKE_INSTALL_PREFIX="$myRepo"/install/"$RepoSource" "$myRepo/$RepoSource"

   with no Perf tests, no tests, no doc, no CUDA and no example

   CMAKE_OPTIONS='-DBUILD_PERF_TESTS:BOOL=OFF -DBUILD_TESTS:BOOL=OFF -DBUILD_DOCS:BOOL=OFF  -DWITH_CUDA:BOOL=OFF -DBUILD_EXAMPLES:BOOL=OFF'

5. In git command line enter the following command :

   ./installTesseract.sh

6. now we need the language files from tesseract. either clone https://github.com/tesseract-ocr/tessdata, or copy only those language files you need to a folder (example c:\lib\install\tesseract\tessdata). If you don't want to add a new folder you must copy language file in same folder than your executable
7. if you created a new folder, then you must add a new variable, TESSDATA_PREFIX with the value c:\lib\install\tessdata to your system's environment
8. add c:\Lib\install\leptonica\bin and c:\Lib\install\tesseract\bin to your PATH environment. If you don't want to modify the PATH then copy tesseract400.dll and leptonica-1.74.4.dll to the same folder than your exe file.