Congrats to Microsoft and IBM for releasing the source code to MS-DOS 4 under an #OpenSource license!
However, you may have some problems in compiling the code as-is; the OS/2 Museum has a discussion about the issues, but the 1-line takeaway is DOS Code Page 437 is not the same as UTF-8. FreeDOS developer 'ecm' shared on our freedos-devel email list what you need to do to fix it.
