MSC 5.1 - CL.EXE does not work due to missing DOS API ah=46h

[LowLevelMahn]

it works on dosbox but i like kvikdos more for its speed and beeing smaller

Error from compilation:

./kvikdos/kvikdos msc5.1/BIN/CL.EXE sieve.C

Microsoft (R) C Optimizing Compiler Version 5.10
Copyright (c) Microsoft Corp 1984, 1985, 1986, 1987, 1988. All rights reserved.

fatal: unsupported int 0x21 ah:46 cs:0110 ip:4b4d
fatal: regs: cs:0054 ip:0022 ax:4601 bx:0001 cx:0002 dx:1764 si:0000 di:304e sp:3006 bp:300c flags:00007097 ds:076f es:076f fs:0064 gs:0064 ss:076f

this API is missing: https://dos-help.soulsphere.org/alang.hlp/x_at_L82e7.html

if you want to fix that problem the MSC 5.1 compiler was released to the public with the MS-DOS 4.0 release

https://github.com/microsoft/MS-DOS/tree/main
https://github.com/microsoft/MS-DOS/tree/main/v4.0/src/TOOLS/CL.EXE
https://github.com/microsoft/MS-DOS/tree/main/v4.0/src/TOOLS/LINK.EXE
https://github.com/microsoft/MS-DOS/tree/main/v4.0/src/TOOLS/MASM.EXE

here a small zip file with a tiny dosbox config which builds a simple C and a ASM example
sample.zip
(MASM.EXE and LINK.EXE seems to work without problems i just added them here for convinience)

run with dosbox -conf msc51.conf
the config is based on the MS-DOS 4.0 release executables in the Microsoft MS-DOS git repo

[autoexec]
mount c .
mount d ~/kvikdos_test/MS-DOS/v4.0/src
c:
  
SET PATH=%PATH%;D:\TOOLS
SET LIB=D:\TOOLS\BLD\LIB
SET INCLUDE=D:\TOOLS\BLD\INC

CL.EXE SIEVE.C
CL.EXE /c SIEVE.C
LINK.EXE SIEVE.obj,,,,

MASM.EXE hello.asm,,,,
LINK.EXE hello.obj,,,,

pause

exit