This guide explains how to build Krita from standard Qt 5 and KDE Frameworks 5 development packages provided with your favorite linux distribution. This should be straightforward, but for more detail you can look into the old instructions for building Calligra.
Here are the names of Krita's dependencies in the Debian repositories.
sudo apt install extra-cmake-modules \ libkf5archive-dev \ libkf5completion-dev \ libkf5config-dev \ libkf5coreaddons-dev \ libkf5guiaddons-dev \ libkf5i18n-dev \ libkf5itemmodels-dev \ libkf5itemviews-dev \ libkf5widgetsaddons-dev \ libkf5windowsystem-dev \ libkf5kiocore5 \ libkf5crash-dev \ libkf5kio-dev \ qtbase5-dev \ libqt5svg5-dev \ libqt5multimedia5 \ qtdeclarative5-dev \ libqt5x11extras5-dev \ libqt5opengl5-dev \ libeigen3-dev \ libxi-dev \ libboost-all-dev \ libopenexr-dev \ vc-dev \ libexiv2-dev \ libgsl-dev \ liblcms2-dev \ libpoppler-qt5-dev \ shared-mime-info \ libraw-dev \ libfftw3-dev \ libpng-dev \ libopencolorio-dev
Building Krita 3.x on Arch requires often to check the last PKGBUILD of official Arch Package.
To do this, go to [] and check the 'Source File' ( top-right ) and then open the PKGBUILD file []. It will give you hint if you miss or need to add a library. At september 2016, the list look like this:
sudo pacman -S --needed base-devel kio kitemmodels gsl libraw opencolorio exiv2 openexr fftw curl boost-libs hicolor-icon-theme extra-cmake-modules kdoctools python boost eigen vc poppler-qt5 poppler-qt5
sudo dnf install -y extra-cmake-modules \ make cmake automake gcc gcc-c++ kernel-devel \ kf5-karchive-devel \ kf5-kcompletion-devel \ kf5-kconfig-devel \ kf5-kcoreaddons-devel \ kf5-kguiaddons-devel \ kf5-ki18n-devel \ kf5-kitemmodels-devel \ kf5-kitemviews-devel \ kf5-kwidgetsaddons-devel \ kf5-kwindowsystem-devel \ kf5-kio-core \ kf5-kcrash-devel \ kf5-kio-devel \ qt5-qtbase \ qt5-qtbase-devel \ qt5-qtsvg-devel \ qt5-qtmultimedia qt5-qtmultimedia-devel \ qt5-qtdeclarative-devel \ qt5-qtx11extras-devel \ eigen3-devel \ libXi-devel \ boost-* boost-*-devel \ OpenEXR-libs OpenEXR-devel \ exiv2-libs exiv2-devel libgexiv2 \ gsl-devel \ lcms2-devel \ poppler-qt5-devel \ shared-mime-info \ LibRaw-devel \ fftw-devel \ libpng-devel \ OpenColorIO-devel
Once you have installed the dependencies, you are ready to clone the Krita repository.
cd ~/kf5/src (Or, wherever you want to download the source code) git clone git://anongit.kde.org/krita
Krita's build system has diverged from the Calligra build system. For example, Krita does not use productsets any longer.
Optimization level RelWithDebInfo is nearly always good enough for everyday debugging, and it can be used to paint with. Basically we have two build modes: for painters and for developers.
cd ~/kf5/build/krita cmake ~/kf5/src/krita \ ## your source directory -DCMAKE_INSTALL_PREFIX=~/kf5/inst \ ## your installation directory -DCMAKE_BUILD_TYPE=RelWithDebInfo \ -DBUILD_TESTING=FALSE \ -DHIDE_SAFE_ASSERTS=TRUE make -j8 install
cd ~/kf5/build/krita cmake ~/kf5/src/krita \ ## your source directory -DCMAKE_INSTALL_PREFIX=~/kf5/inst \ ## your installation directory -DCMAKE_BUILD_TYPE=RelWithDebInfo \ -DBUILD_TESTING=TRUE \ -DHIDE_SAFE_ASSERTS=FALSE make -j8 install
Remember that you can change build settings with cmake . -DNEW_SETTING or by using cmake-gui found in the package cmake-qt-gui
XDG_DATA_DIRS. You need only one environment variable to run Krita 3:
KRITA_PLUGIN_PATH. Currently, running inside a debugger can be a bit fragile due to plugin loading. Krita's plugins are built in several different paths inside the source directory, and the installation process copies them into a single folder. However the debugger might accidentally not catch onto the plugin installation directory. (For example, if it thinks the plugin path is ./build/krita/plugins/ then it will miss the plugins contained in ./build/plugins/. It may be possible in the future to fix this by altering Krita's codebase, but such large changes are not yet possible until the break with Calligra repo is more complete.)
You can force Krita to look in a specific folder for plugins using the environment variable KRITA_PLUGIN_PATH. For example, using Kubuntu and installing Krita in ~/, I can use a debugger if I set the environment variable:
QT_MESSAGE_FORMAT and QT_LOGGING_RULES See main.cc and http://woboq.com/blog/nice-debug-output-with-qt.html