Install tesseract and leptonica from source

tesseract_git_install.sh

#!/usr/bin/env bash

# This script installs leptonica and tesseract from source
# it does not install other pre-requisites to a custom location.

# side note: install prefix is defined once per library.
# side note: it clones git repositories in the current directory.

set -e
set -u

# install leptonica
(
export INSTALL_PREFIX=~/.sources
git clone https://github.com/DanBloomberg/leptonica.git
mkdir leptonica/build ; cd leptonica/build
cmake -DCMAKE_INSTALL_PREFIX=$INSTALL_PREFIX -DBUILD_PROG=1 ..
make -j8
make install
)
# install tesseract
(
export INSTALL_PREFIX=~/.sources
git clone https://github.com/tesseract-ocr/tesseract.git
mkdir tesseract/build ; cd tesseract/build
PKG_CONFIG_PATH=$INSTALL_PREFIX/lib/pkgconfig cmake -DCMAKE_INSTALL_PREFIX=$INSTALL_PREFIX ..
make -j8
make install
)
# install and test with tessdata
(
git clone https://github.com/tesseract-ocr/tessdata.git
tesseract --tessdata-dir ./tessdata -l heb ./tesseract/testing/hebrew.png out
)