KOS (KallistiOS) SDK

D3-TUI requires the KallistiOS Dreamcast development SDK:

# Clone KOS
git clone https://github.com/KallistiOS/KallistiOS.git /opt/toolchains/dc/kos

# Or use existing KOS if available
export KOS_BASE=/path/to/your/kos

SH4 Toolchain

The SH4 cross-compiler is required:

# Standard toolchain location
/opt/toolchains/dc/sh4elf

# Ensure bin directory is in PATH
export PATH="$KOS_BASE/../sh4elf/bin:$PATH"