Krita on Debian

install-krita.sh

#!/bin/sh
# See http://www.davidrevoy.com/article193/guide-building-krita-on-linux-for-cats

# Directory setup
SOURCE=~/src/software/calligra
BUILD=~/src/software/krita
INSTALL=/opt/krita
mkdir -p $SOURCE $BUILD $INSTALL

# Install dependencies
sudo apt-get install -y git make cmake libboost-dev kdepimlibs5-dev libeigen2-dev okular-dev libgsf-1-dev libwpd-dev libwpg-dev libwps-dev libpstoedit-dev libglew-dev libgsl0-dev automoc libkdcraw-dev libpqxx3-dev fftw-dev libopenigtlink1-dev liblcms2-dev libvc-dev

# Download the source
if [ -d $SOURCE/.git/ ]; then
    cd $SOURCE;
    git pull
else
    git clone git://anongit.kde.org/calligra.git $SOURCE
fi

# Configure
cd $BUILD
cmake -DCMAKE_INSTALL_PREFIX=$INSTALL $SOURCE -DCMAKE_BUILD_TYPE=RelWithDebInfo -DPRODUCTSET=CREATIVE -DBUILD_karbon=OFF

# Build
make -j `nproc`

# Install
sudo make install -j `nproc`

Your script is lacking l10n support.

A new approach would be like this:

sudo apt update
sudo apt install krita krita-l10n