This project is a native C11 + SDL3 re-implementation of the SiglusEngine runtime, reverse-engineered to keep the visual novel Sayonara o Oshiete ~ Comment te Dire Adieu ~ playable on Linux, Windows and macOS. The fan English patch v1.1 is supported as an overlay, with a language selector at start-up.

No game files are included in this repository. You need your own copy of the game. Everything game-related is extracted at build time from the original archives. The engine binaries themselves are about 7 MB and contain no game data.

This project is not affiliated with VisualArt's, or the English patch's translators.

Screenshots

The same engine runs natively on each platform. The title screen is shown here on macOS and Windows.

macOS	Windows

Required input files

The builder accepts only these two archives in specific. The checksums have to match.

Archive	SHA-256
Sayonara-o-Oshiete-Comment-te-Dire-Adieu_Win_JA_Download-Edition.zip	fb61c609b6e11ea80efde830f2638f3b4aae53c72406edd5860b59519228a9ec
SayonaraWoOshiete_EnglishPatch_v1.1.zip (download)	88e6795ac5d656fe7be2956e5fc29f643ecc9d6e1aaafd3df5af6c289320e9fe

Quickstart

Use the web builder or build from the source code. Both options result in the same executable.

Web builder (no installation):

1. Open the web builder page in a browser.
2. follow the insturcions from the web builder.

For more information, read site/README.md.

Build from the source code:

1. Install the build dependencies.
2. Put the two archives in ../assets, next to this directory.
3. Run make build. For a Windows build, run make build-windows.
4. Start the game: ./dist/linux-x86_64/sayooshi.

If a step fails, run make check. This command shows each missing dependency. Then read Dependencies.

Build

Dependencies

Build dependencies

GNU make and a C compiler. All targets need GNU make and a C11 compiler (gcc or clang).

• Debian, Ubuntu: sudo apt install build-essential
• Fedora: sudo dnf install gcc make
• Arch Linux: sudo pacman -S base-devel
• macOS: xcode-select --install

7-Zip. The build uses 7-Zip to extract the game archive and the installer of the English patch.

• Debian 12 or later, Ubuntu 24.04 or later: sudo apt install 7zip
• Older Debian and Ubuntu releases: sudo apt install p7zip-full
• Fedora: sudo dnf install p7zip p7zip-plugins
• Arch Linux: sudo pacman -S 7zip
• macOS: brew install sevenzip

CMake and curl. The first build downloads SDL 3.4.16 with curl (or wget) and examines its SHA-256. Then CMake builds a static SDL library into build/deps/. This occurs one time for each platform.

• Debian, Ubuntu: sudo apt install cmake curl
• Fedora: sudo dnf install cmake curl
• Arch Linux: sudo pacman -S cmake curl
• macOS: brew install cmake (macOS includes curl)

SDL development headers (Linux only). The Linux build needs the X11, Wayland and audio development headers. The engine loads these libraries at run time. Thus the binary links only to libc and libm.

• Debian, Ubuntu:

  sudo apt install libx11-dev libxext-dev libxrandr-dev libxcursor-dev libxi-dev libxfixes-dev \
    libxss-dev libxtst-dev libwayland-dev libxkbcommon-dev wayland-protocols libegl-dev \
    libasound2-dev libpulse-dev libpipewire-0.3-dev libdbus-1-dev libudev-dev libdrm-dev \
    libgbm-dev libdecor-0-dev
  

• Fedora:

  sudo dnf install libX11-devel libXext-devel libXrandr-devel libXcursor-devel libXi-devel \
    libXfixes-devel libXScrnSaver-devel libXtst-devel wayland-devel libxkbcommon-devel \
    wayland-protocols-devel mesa-libEGL-devel alsa-lib-devel pulseaudio-libs-devel \
    pipewire-devel dbus-devel systemd-devel libdrm-devel mesa-libgbm-devel libdecor-devel
  

• Arch Linux:

  sudo pacman -S libx11 libxext libxrandr libxcursor libxi libxfixes libxss libxtst wayland \
    libxkbcommon wayland-protocols mesa alsa-lib libpulse pipewire dbus systemd-libs libdrm libdecor
  

Windows cross-compiler (optional). make build-windows needs no installation. The build downloads a pinned llvm-mingw toolchain and examines its SHA-256. If you have mingw-w64, the build uses it.

• Debian, Ubuntu: sudo apt install mingw-w64
• Fedora: sudo dnf install mingw64-gcc
• Arch Linux: sudo pacman -S mingw-w64-gcc
• macOS: brew install mingw-w64

Python 3. make site uses Python 3 to put the engines into site/.

• Debian, Ubuntu: sudo apt install python3
• Fedora: sudo dnf install python3
• Arch Linux: sudo pacman -S python
• macOS: brew install python

Development dependencies

Valgrind (Linux only). make valgrind, make helgrind and make drd need Valgrind.

• Debian, Ubuntu: sudo apt install valgrind
• Fedora: sudo dnf install valgrind
• Arch Linux: sudo pacman -S valgrind

ASan and UBSan runtimes. make dev SAN=1 needs the sanitizer runtimes. gcc on Debian, Ubuntu and Arch Linux includes them. Xcode includes them on macOS.

• Fedora: sudo dnf install libasan libubsan

Build steps

1. Put the two archives in ../assets, next to this directory. Alternatively, use JA_ZIP=FILE and EN_ZIP=FILE on the command line.
2. Run make check. Install all missing dependencies.
3. Run make build. The result is dist/linux-x86_64/sayooshi (on macOS: dist/macos-universal/Sayonara.app).
4. Run make build-windows for Windows. The result is dist/windows-x86_64/Sayonara.exe.
5. Start the game: ./dist/linux-x86_64/sayooshi.

Other targets

• make run builds a development binary and starts it with the data in build/data. Use RUN_ARGS="--lang en" to give options.
• make data makes only the data tree.
• make build-all builds all targets that this host can build.
• make clean removes the objects. make fclean also removes dist/, the downloads and the data.
• make info shows the configuration. make help shows all targets and variables.

Cross-compilation

• Linux to Windows: this works without more installation.
• Linux to macOS: this needs osxcross and an Apple SDK. You must get the SDK yourself.
• Alternatively, do the macOS build on a Mac.
• The macOS build is ad-hoc signed. It is not notarized. To start it the first time, right-click the app and select Open.

Web builder

The web builder in site/ makes the same executables in the browser. The user selects the two archives. The page examines the SHA-256 of each archive. Then the page unpacks the archives in the browser tab. The page adds the game data to an engine without game data. The page does not upload files.

• make site builds the engines this host can make (Linux or macOS, plus Windows) and puts them into site/engines/. It keeps the other targets from the last run. Run it on a Mac and on Linux, then commit.
• make site-serve starts a local server at http://localhost:8000.
• make website assembles the deployed site in build/website: website/ at the root, the builder under /sayooshi/, stamped with the commit hash and its date. make website-serve serves it.
• To deploy, link the repository on Netlify. netlify.toml runs tools/site/website.sh and publishes build/website.
• For more information, read site/README.md.

Game controls

• Language. A selector (日本語 / English) shows first. It selects the last language that you used. The option --lang ja or --lang en skips the selector. To change the language during play, select Settings, then "Language / 言語".
• Controls. Click, Enter or Space: show the next text. Right-click or Esc: open the system menu. Hold Ctrl: skip. Mouse wheel up: open the backlog. F11 or Alt+Enter: full screen. Gamepads also operate the game.
• Options. --scale N sets the window size. --nearest makes the scaled image sharp. --fullscreen starts in full screen. --help shows all options.
• Fonts. The Japanese text uses a system font: MS Gothic, Hiragino, Noto CJK or IPA. If the system has no Japanese font, the game uses its built-in font (Kosugi). To use a different font, use --font FILE.
• Windows. The game shows no console window. Use --console to see the log. The game needs Windows 10 or later.

Savefile paths

The game keeps all save files in one directory. The file format is cross platform compatible.

• Linux: ~/.local/share/sayooshi/sayooshi/
• Windows: %APPDATA%\sayooshi\sayooshi\
• macOS: ~/Library/Application Support/sayooshi/sayooshi/

Portable mode, the export and import options and the file format are in docs/SAVE_FORMAT.md.