Setting up Development Environment

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Revision as of 15:27, 23 August 2015 by Fincs (talk | contribs) (Replace "Optional Tools and Libraries" section with a link to "Homebrew Libraries and Tools")
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  • Install devkitARM. If it's already installed, update it. On Windows there's a GUI installer. On Linux/Mac there's a perl-script. Make sure you also select ctrulib when installing.
  • Download the files in the ctrulib repository (even though the library has already been installed) because the repository contains a 3DS project template and examples.
  • Depending on the kind of homebrew you want to develop, you may be interested in installing and using additional libraries and tools which don't ship alongside devkitARM/libctru. A list of them can be found in Homebrew Libraries and Tools.


  • First get the devkitARM updater Perl script for Linux.
  • Run it with superuser privileges if your /opt directory is not marked world read-writeable.
  • Get ctrulib from Smealum's GitHub repository, build and install it.
sudo apt-get install git curl
curl -L -o
chmod +x ./
sudo -s
./ /opt/devkitpro
cd /opt/devkitpro
git clone
cd ctrulib/libctru
export DEVKITPRO=/opt/devkitpro
make install
echo "export DEVKITPRO=/opt/devkitpro" >> ~/.bashrc
echo "export DEVKITARM=\$DEVKITPRO/devkitARM" >> ~/.bashrc
echo "export PATH=\$PATH:\$DEVKITARM/bin" >> ~/.bashrc
source ~/.bashrc

Building the examples

3DS examples are still being created. Currently there are a few examples in the separate ctrulib download under the "examples" folder.

  • arm11u: simple homebrew example
  • sdmc: demonstrates how to access files on the SD card
  • mic: demonstrates how to read sound from the microphone
  • gpu: demonstrates how to render 3D geometry with the GPU

Building the examples on Linux with Netbeans

  • Go to File->New Project...
  • Select C/C++ Project with existing code
  • Navigate to the examples directory and select the folder for the project you want to build; eg. /home/vtsingaras/3ds/examples/app_launch
  • Leave Configuration Mode to 'Automatic' and click 'Finish'.
  • It will fail to build. Now edit Makefile and insert these two lines, adjusting for your devkitpro path, at the top:
export DEVKITPRO=/opt/devkitpro
export DEVKITARM=/opt/devkitpro/devkitARM
  • Right-click the project and go to Properties->Code Assistance and click C Compiler.
  • In include directories enter

adjusting again for your devkitPro path.

  • Do the same for 'C++ Compiler'.
  • Go to 'Run' and click 'Clean and Build Project'.
  • Now right-click on the project and select Code Assistance->Reparse Project.

Now you can use Netbeans' code completion feature and build your project from the Run menu.

Building homebrew for distribution

To build your homebrew open a terminal, browse to your homebrew's folder and run make.

  • This will build a .elf file and a .3dsx file together with an icon. The icon and .3dsx file are the format required for the Homebrew Channel.
  • To build a Gateway-compatible .3ds file you need to strip the .elf file and use makerom on it (with the provided RSF file):
arm-none-eabi-strip [ELF file]
makerom -f cci -o [.3ds file] -rsf [RSF file] -target d -exefslogo -elf [ELF file] -icon [icon file] -banner [banner file]