(possible workflow to build compiler toolchain on Linux build machine, for Linux host and/or DJGPP/MS-DOS host)

     «START»
        ▾
./fetch.sh
        ▾
./build.sh clean ─────┐
        │             ▾
        │  ./build.sh binutils-debug
        ▾             │
./build.sh binutils ◂─┘
        ▾
./build.sh prereqs
        ▾
./build.sh gcc1 ◂───────────────┐
        ▾                       │
./build.sh newlib               │
        ▾                       │
./build.sh causeway ──┐         │
        │             ▾         │
        │  ./build.sh elks-libc │
        │             ▾         │
        │  ./build.sh elf2elks  │
        ├◂────────────┘         │
        ▾                       │
./build.sh libi86 ────────────────────────────┐
        ▾                       │             ▾
./build.sh gcc2 ──────┐         │     ./build.sh clean-djgpp
        │             ▾         │             ▾
        │  ./build.sh extra     │     ./build.sh prereqs-djgpp
        ├◂────────────┘         │             ▾
        ├─────────────┐         │     ./build.sh binutils-djgpp
        │             ▾         │             ▾
        │  ./build.sh sim       │     ./build.sh gcc-djgpp
        │             ▾         │             │
        │  ./build.sh test ─────┘             │
        ├◂────────────┘                       │
        ├─────────────┐                       │
        │             ▾                       ▾
        ▾  ./redist-ppa.sh all        ./redist-djgpp.sh all
      «END» ◂─────────┴◂──────────────────────┘

• The Linux-hosted toolchain will be installed in the prefix/ subdirectory under this top-level directory. To use the newly-built toolchain, you can add .../prefix/bin to your $PATH.
• The DJGPP-hosted toolchain — if any — will appear under prefix-djgpp/.
• You can specify multiple build stages together when running build.sh. E.g., ./build.sh binutils prereqs gcc1.

Pre-compiled compiler toolchain packages

• A pre-compiled Ubuntu Personal Package Archive is now available.
• There are also binary FreeDOS packages for the toolchain and for libi86. The toolchain requires a 32-bit machine (i.e. 80386 or above), but it will produce 16-bit code.

Further information

• A write-up on the ELF relocation schemes implemented for IA-16 segmented addressing.
• libi86 project home page, including documentation.