Microsoft open-sourced MS-DOS 4.0.

[NON]

Originally Posted by wx69wx2023

I only have mobie now, I should try to build when I am at home.
.
See the Runme.bat, it give the guide.
echo off
cls
echo **********************************************************************
echo * *
echo * MS-DOS 4.00 Build Notes *
echo * *
echo * The following steps must be taken to ensure a proper and *
echo * complete build of the MS-DOS 4.00 sources. *
echo * *
echo * 1.) Build environment setup, the setenv.bat batch file provided *
echo * will automate this process. This batch file must be modified *
echo * to reflect the individual build environment, ie the drive *
echo * volume and path. *
echo * *
echo * 2.) The nmake utility is used to build the MS-DOS 4.00 sources. *
echo * the global build is started by invoking nmake at the top- *
echo * most directory level. Individual modules are built by *
echo * changing to the particular directory and running nmake. *
echo * Useful Nmake switches: *
echo * *
echo * NMAKE -I : Ignore build errors. *
echo * NMAKE -I -X - Redirect to FILENAME : Redirects stdout-stderr *
echo * *
echo * 3.) After the build is complete the cpy.bat batch file can be *
echo * used to gather the binaries. The cpy.bat file will copy the *
echo * binaries to the directory specified on the command line. *
echo * For example: *
echo * *
echo * To use cpy.bat to copy the binaries to the bin directory on *
echo * C: drive you would use the following command: *
echo * *
echo * cpy c:\bin *
echo * *
echo * *
echo **********************************************************************
echo on


So you must run Setenv.bat first,and have installed nmake.

Thank you! I'd previously missed out so many intermediate steps. Now with the help of the info you've provided, it's compiling correctly.