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# Setting up the development environment for GNU/Linux
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## Required software
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Building OpenToonz from source requires the following dependencies:
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- Git
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- GCC or Clang
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- CMake (3.4.1 or newer).
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- Qt5 (5.9 or newer)
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- Boost (1.55 or newer)
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- LibPNG
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- SuperLU
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- Lzo2
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- FreeType
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- LibMyPaint (1.3 or newer)
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- Jpeg-Turbo (1.4 or newer)
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- OpenCV 3.2 or newer
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### Installing Dependencies on Debian / Ubuntu
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```
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$sudo apt-get install build-essential git cmake pkg-config libboost-all-dev qt5-default qtbase5-dev libqt5svg5-dev qtscript5-dev qttools5-dev qttools5-dev-tools libqt5opengl5-dev qtmultimedia5-dev libqt5multimedia5-plugins libqt5serialport5-dev libsuperlu-dev 
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liblz4-dev libusb-1.0-0-dev liblzo2-dev libpng-dev libjpeg-dev libglew-dev freeglut3-dev libfreetype6-dev libjson-c-dev qtwayland5 libmypaint-dev libopencv-dev libturbojpeg-dev
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```
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For newest versions of OS you may install libmypaint from repository and don't need to build it from source:
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```
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$ sudo apt-get install libmypaint-dev
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```
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Notes:
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* It's possible we also need `libgsl2` (or maybe `libopenblas-dev`)
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* We may also need `libegl1-mesa-dev libgles2-mesa-dev libglib2.0-dev liblzma-dev`
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* For Qt, MyPaint and OpenCV, you can alternatively build and install from source.
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### Installing Dependencies on Fedora
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(it may include some useless packages)
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```
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$ sudo dnf install gcc gcc-c++ automake git cmake boost boost-devel SuperLU SuperLU-devel lz4-devel lzma libusb-devel lzo-devel libjpeg-turbo-devel libGLEW glew-devel freeglut-devel freeglut freetype-devel libpng-devel qt5-qtbase-devel qt5-qtsvg qt5-qtsvg-devel qt5-qtscript qt5-qtscript-devel qt5-qttools qt5-qttools-devel qt5-qtmultimedia-devel blas blas-devel json-c-devel libtool intltool make qt5-qtmultimedia turbojpeg-devel opencv-devel qt5-qttools-static qt5-qtserialport-devel
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```
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For newest versions of OS you may install libmypaint from repository and don't need to build it from source:
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```
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$ sudo dnf install libmypaint-devel
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```
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### Installing Dependencies on ArchLinux
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```
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$ sudo pacman -S base-devel git cmake boost boost-libs qt5-base qt5-svg qt5-script qt5-tools qt5-multimedia lz4 libusb lzo libjpeg-turbo glew freeglut freetype2
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$ sudo pacman -S blas cblas
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```
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From AUR, using eg. yaourt:
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```
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$ yaourt -S superlu libmypaint
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```
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Notes:
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* ArchLinux has `blas` split into `blas` and `cblas`.
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### Installing Dependencies on openSUSE
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```
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$ zypper in boost-devel cmake freeglut-devel freetype2-devel gcc-c++ glew-devel libQt5OpenGL-devel libjpeg-devel liblz4-devel libpng16-compat-devel libqt5-linguist-devel libqt5-qtbase-devel libqt5-qtmultimedia-devel libqt5-qtscript-devel libqt5-qtsvg-devel libtiff-devel libusb-devel lzo-devel openblas-devel pkgconfig sed superlu-devel zlib-devel json-c-devel libqt5-qtmultimedia
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```
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For newest versions of OS you may install libmypaint from repository and don't need to build it from source:
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```
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$ zypper install libmypaint-devel
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```
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## Build libmypaint dependency
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If your linux distributions does not have libmypaint package, then build it from the source:
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```
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$ git clone https://github.com/mypaint/libmypaint.git -b v1.3.0
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$ cd libmypaint
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$ ./autogen.sh
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$ ./configure
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$ make
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$ sudo make install
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$ sudo ldconfig
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$ cd ..
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```
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## Build instructions
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### Cloning the GIT Tree
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```
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$ git clone https://github.com/opentoonz/opentoonz
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```
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### Copying the 'stuff' Directory
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TODO: some parts should really be installed in $prefix/ instead... and some other in various cache or user-local places.
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cf. https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
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Until then we just follow the Win32/OSX layout.
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The `~/.config/OpenToonz/` directory contains your settings, work and other files.
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Initialize this path with the following commands:
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```
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$ mkdir -p $HOME/.config/OpenToonz
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$ cp -r opentoonz/stuff $HOME/.config/OpenToonz/
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```
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*Currently this is required to run OpenToonz.*
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### Building LibTIFF
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TODO: make sure we can use the system libtiff instead and remove this section.
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Features from the modified libtiff are needed currently, so this isn't a simple switch.
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```
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$ cd opentoonz/thirdparty/tiff-4.0.3
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$ ./configure --with-pic --disable-jbig
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$ make -j$(nproc)
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$ cd ../../
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```
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### Building OpenToonz
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```
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$ cd toonz
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$ mkdir build
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$ cd build
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$ cmake ../sources
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$ make -j$(nproc)
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```
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The build takes a lot of time, be patient. CMake may not pick up all the required dependencies. On Fedora 30, it can be helpful to use 
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```
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$cmake ../sources/ -DSUPERLU_INCLUDE_DIR=/usr/include/SuperLU
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```
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instead of just
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```
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$cmake ../sources/
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```
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### Troubleshooting Build Errors
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If something doesn't compile or link, please run `make` this way to help spot the problem:
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```
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$ LANG=C make VERBOSE=1
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```
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#### Debug Build
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If you need to debug the application, you should be able to use `cmake -DCMAKE_BUILD_TYPE=Debug`.
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### Running OpenToonz
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You can now run the application:
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```
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$ LD_LIBRARY_PATH=./lib/opentoonz:$LD_LIBRARY_PATH
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$ ./bin/OpenToonz
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```
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### Performing a System Installation
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The steps above show how to run OpenToonz from the build directory,
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however you may wish to install OpenToonz onto your system.
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OpenToonz will install to `/opt/opentoonz` by default, to do this run:
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```
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$ sudo make install
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```
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Then you can launch OpenToonz by running `/opt/opentoonz/bin/opentoonz`.
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You can change the installation path by modifying the `CMAKE_INSTALL_PREFIX` CMake variable.
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----
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# Linux Package Definitions
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It may be helpful to use existing packages as a reference when creating a package for your own distribution.
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- ArchLinux (AUR):
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  https://aur.archlinux.org/packages/opentoonz-git/
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- App-Image (Portable):
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  https://github.com/morevnaproject/morevna-builds
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