how to build a.out to running under dos system

[loody <miloody@xxxxxxxxx>]

Dear all:
I try to make some program to run under dos system.
But in the Makefile, it seems I need another file called, coff2exe, like below.
.....
exe: cjpeg djpeg rdjpgcom wrjpgcom
        coff2exe cjpeg
	coff2exe djpeg
	coff2exe rdjpgcom
	coff2exe wrjpgcom
....
I have google the keyword "coff2exe", but it shows some other Makefile
contents like me.
Would someone tell me where to get it or use another way to build my
a.out to running under dos system?
appreciate your help,
miloody

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