🏗 Build Tesseract from source

Dockerfile

@@ -5,18 +5,51 @@ ENV LC_ALL=C.UTF-8 LANG=C.UTF-8
 RUN mkdir /var/lib/calamari-models
 COPY data/calamari-models/GT4HistOCR /var/lib/calamari-models/GT4HistOCR
 
+
 RUN apt-get update && \
     apt-get install -y \
+      curl xz-utils \
+      python3-pip \
       git \
-      libleptonica-dev \
-      libtesseract-dev \
+# For leptonica/tesseract:
+      cmake libgif-dev libjpeg-dev libpng-dev libtiff-dev zlib1g-dev \
+# For clstm on Ubuntu 19.04:
+      swig libeigen3-dev libpng-dev libprotobuf-dev \
+# XML utils
       libxml2-utils \
-      python3-pip \
-      tesseract-ocr-all \
       xmlstarlet \
     && \
     apt-get clean
 
+
+# Build Leptonica and Tesseract.
+# XXX Use a multi stage build for this.
+ENV LEPTONICA_VERSION 1.78.0
+ENV TESSERACT_VERSION 4.1.0
+ENV TESSDATA_BEST_VERSION 4.0.0
+
+ENV TESSDATA_PREFIX /usr/local/share/tessdata
+
+RUN curl -sSL -O https://github.com/DanBloomberg/leptonica/releases/download/$LEPTONICA_VERSION/leptonica-$LEPTONICA_VERSION.tar.gz && \
+    tar xvzf leptonica-$LEPTONICA_VERSION.tar.gz && \
+    cd leptonica-$LEPTONICA_VERSION && \
+    mkdir build && cd build && cmake .. && make install && ldconfig && \
+    cd ../.. && rm -rf leptonica-$LEPTONICA_VERSION leptonica-$LEPTONICA_VERSION.tar.gz
+
+RUN curl -sSL -O https://github.com/tesseract-ocr/tesseract/archive/$TESSERACT_VERSION.tar.gz && \
+    tar xvzf $TESSERACT_VERSION.tar.gz && \
+    cd tesseract-$TESSERACT_VERSION && \
+    mkdir build && cd build && cmake .. && make install && ldconfig && \
+    cd ../.. && rm -rf tesseract-$TESSERACT_VERSION $TESSERACT_VERSION.tar.gz
+
+RUN curl -sSL -O https://github.com/tesseract-ocr/tessdata_best/archive/$TESSDATA_BEST_VERSION.tar.gz && \
+    tar xvzf $TESSDATA_BEST_VERSION.tar.gz && \
+    mv tessdata_best-$TESSDATA_BEST_VERSION $TESSDATA_PREFIX && \
+    rm -rf $TESSDATA_BEST_VERSION.tar.gz && \
+    tesseract --list-langs
+
+
+
 COPY requirements.txt /tmp
 RUN pip3 install --no-cache-dir -r /tmp/requirements.txt