How to build Enhanced DR-DOS from ecm repo
                 ==========================================

2023 by C. Masloch. Public Domain.

This document has been compiled on 2024-01-14.

 1. Set up dosemu2

     1. Make sure to use FreeCOM as the shell

     2. When redirecting a host directory to a DOS drive using -K, then the
        DOS drive I: still must be unused

     3. A recent FreeCOM build can be obtained from the build at
        https://pushbx.org/ecm/download/freecom.zip

     4. There is a blog post on how to set up dosemu2:
        https://pushbx.org/ecm/dokuwiki/blog:pushbx:setupdosemu2

 2. Set up WarpLink

     1. Build WarpLink (requires NASM, dosemu2, and warplink.exe itself) or
        obtain a build

     2. Place resulting executable in DOS PATH as warplink.exe

     3. A build can be obtained from
        https://pushbx.org/ecm/download/warplink.zip (rename wl.exe to use
        it as warplink.exe)

 3. Set up x2b2

     1. Build x2b2 (requires NASM and lmacros) and place in DOS PATH

     2. A build can be obtained from
        https://pushbx.org/ecm/download/x2b2.zip

 4. Set up JWasm

     1. Build DJGPP executable of JWasm and place as C:\BIN\JWASM.EXE

     2. A build can likely be obtained from https://github.com/Baron-von-
        Riedesel/JWasm/releases/

 5. Set up OpenWatcom

     1. Insure to have no files in DOS named C:\C0NFIG.SYS or
        C:\AUTOEXEC.BAT

     2. Download OpenWatcom 1.9 DOS installer from
        http://openwatcom.org/ftp/install/open-watcom-c-dos-1.9.exe

     3. Run installer in dosemu2

     4. Install to C:\WATCOM

     5. Choose the full installation

     6. Choose for the installer to "Make all the modifications for you"

     7. Rename the created file C:\AUTOEXEC.BAT to C:\AUTOWAT.BAT after the
        installer is done

     8. The created file C:\CONFIG.SYS should have just the line FILES=20
        so make sure to configure at least that many SFT entries in
        FDCONFIG.SYS

 6. Set up IA16 gcc

     1. Use https://gitlab.com/tkchia/build-ia16

     2. Make ia16-elf-gcc available in the Linux path

 7. Set up the following repos as sister directories of the edrdos repo:
    (accesible as ../REPO/ from edrdos repo)

     1. lmacros

     2. ldosboot

     3. inicomp

     4. scanptab

 8. Make lzip available in the Linux path, from https://www.nongnu.org/lzip/

 9. Make NASM available in Linux path

 10.Run mak script from edrdos repo (repo root as host cwd), as ./mak.sh

 11.Alternatively, set up DOS drive I: to point to the repo's drdos/
    subdirectory, call the C:\AUTOWAT.BAT file (only needed for building
    command.com), then run one of the make.bat scripts from one of the
    subdirectories (drbio/, drdos/, or command/ subdirectory as DOS cwd).

 12.Find files edrdos.sys, edrpack.sys, edrdos.com, or edrpack.com in repo
    root, and command.com in the subdirectory command/bin/

 13.To build this document, you need the Halibut document preparation system

     1. Grab sources from
        https://www.chiark.greenend.org.uk/~sgtatham/halibut/

     2. You may want to get a patch from https://github.com/ecm-
        pushbx/halibut/commit/1ccc3ac

The pack100 / pack101 EDR-DOS kernel packing using UPX is no longer
supported in the lDOS EDR-DOS fork starting 2023 December. Use the build
files edrpack.sys or edrpack.com instead.

Source Control Revision ID
--------------------------

    hg 33c6976eaa60+, from commit on at 2024-01-14 21:25:46 +0100

    If this is in ecm's repository, you can find it at
    https://hg.pushbx.org/ecm/edrdos/rev/33c6976eaa60