Building MS-DOS 4.00 on FreeDOS

You probably saw recently that Microsoft and IBM released the source code to MS-DOS 4.00 on GitHub. This is under the MIT License, which is an open source license and compatible with the GNU General Public License that we use in FreeDOS.

But if you tried to compile the source code release, you may have hit some problems. I understand it builds fine under MS-DOS, which is what you'd expect. But under FreeDOS, you have to clean up the source code a bit before you can build it. The short version of what's going on is that when they put the code into GitHub, GitHub used UTF-8 for encoding, and DOS uses Code Page 437.

Here's how to clean it up.

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