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Building melonDS

Linux
Windows
macOS

Linux

Install dependencies:
- Ubuntu:
  - All versions: sudo apt install cmake extra-cmake-modules libcurl4-gnutls-dev libpcap0.8-dev libsdl2-dev libarchive-dev libenet-dev libzstd-dev
  - 24.04: sudo apt install qt6-{base,base-private,multimedia,svg}-dev
  - 22.04: sudo apt install qtbase6-dev qtbase6-private-dev qtmultimedia6-dev libqt6svg6-dev
  - Older versions: sudo apt install qtbase5-dev qtbase5-private-dev qtmultimedia5-dev libqt5svg5-dev
    Also add -DUSE_QT6=OFF to the first CMake command below.
- Fedora: sudo dnf install gcc-c++ cmake extra-cmake-modules SDL2-devel libarchive-devel enet-devel libzstd-devel qt6-{qtbase,qtmultimedia,qtsvg}-devel wayland-devel
- Arch Linux: sudo pacman -S base-devel cmake extra-cmake-modules git libpcap sdl2 qt6-{base,multimedia,svg} libarchive enet zstd

Download the melonDS repository and prepare:

git clone https://github.com/melonDS-emu/melonDS
cd melonDS

Compile:

cmake -B build
cmake --build build -j$(nproc --all)

Windows

Install MSYS2
Open the MSYS2 terminal from the Start menu:
- For x64 systems (most common), use MSYS2 UCRT64
- For ARM64 systems, use MSYS2 CLANGARM64
Update the packages using pacman -Syu and reopen the same terminal if it asks you to

Install git and clone the repository

pacman -S git
git clone https://github.com/melonDS-emu/melonDS
cd melonDS

Install dependencies:
Replace <prefix> below with mingw-w64-ucrt-x86_64 on x64 systems, or mingw-w64-clang-aarch64 on ARM64 systems.
```
pacman -S <prefix>-{toolchain,cmake,SDL2,libarchive,enet,zstd}`
```
Install Qt and configure the build directory
- Dynamic builds (with DLLs)
  1. Install Qt: pacman -S <prefix>-{qt6-base,qt6-svg,qt6-multimedia,qt6-svg,qt6-tools}
  2. Set up the build directory with cmake -B build
- Static builds (without DLLs, standalone executable)
  1. Install Qt: pacman -S <prefi>-qt5-static
    (Note: As of writing, the qt6-static package does not work.)
  2. Set up the build directory with cmake -B build -DBUILD_STATIC=ON -DUSE_QT6=OFF -DCMAKE_PREFIX_PATH=$MSYSTEM_PREFIX/qt5-static
Compile: cmake --build build

If everything went well, melonDS should now be in the build folder. For dynamic builds, you may need to run melonDS from the MSYS2 terminal in order for it to find the required DLLs.

macOS

Install the Homebrew Package Manager
Install dependencies: brew install git pkg-config cmake sdl2 qt@6 libarchive enet zstd

Download the melonDS repository and prepare:

git clone https://github.com/melonDS-emu/melonDS
cd melonDS

Compile:

cmake -B build -DCMAKE_PREFIX_PATH="$(brew --prefix qt@6);$(brew --prefix libarchive)"
cmake --build build -j$(sysctl -n hw.logicalcpu)

If everything went well, melonDS.app should now be in the build directory.

Self-contained app bundle

If you want an app bundle that can be distributed to other computers without needing to install dependencies through Homebrew, you can additionally run ../tools/mac-libs.rb . after the build is completed, or add -DMACOS_BUNDLE_LIBS=ON to the first CMake command.

Nix (macOS/Linux)

melonDS provides a Nix flake with support for both macOS and Linux. The Nix package manager needs to be installed to use it.

To run melonDS, just type nix run github:melonDS-emu/melonDS.
To get a shell for development, clone the melonDS repository and type nix develop in its directory.

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