From:	Morten Welinder <terra AT diku DOT dk>
Date:	Sat, 8 Apr 1995 23:26:41 +0200
To:	djgpp AT sun DOT soe DOT clarkson DOT edu
Subject:	Makefiles and porting unix programs

There recently was a gripe over a makefile from a program ported
from unix to djgpp.  A frustrated user complained the makefile
contained calls to `mv' and other assorted unix utilities.

I have a few points to make here:

(1) The reason that we who ports unix programs use the utilites
    is not that we want to make life hard for you, but that we
    want life to be easy for ourselves.  A porter want to change
    as little in the makefile as possible because

    (a) it's less work.

    (b) when new updates arrive we like to be able to use "patch"
        and not to have to do the makefile all over again.  (And
        I really mean all over again.)  Some makefiles have a
        tendency to change a lot.

    (c) it's much more stable across different dos versions.  I
        could use `move' instead of `mv', but for which dos versions
        would it work?

    (d) it's much less error-prone because things like `rm *~' which
        occur every once in a while are hard to get right using
        command.com's `del'.  Try it.

(2) The frustrated user starts converting `mv' to `move', `rm' to
    `del' and so on.  This is wrong, wrong, wrong!  You end up with
    a makefile that is very difficult to maintain and often needs
    a specific dos version to do its job.  The right way to do it
    is to get those unix-style commands -- they're free and take up
    only a few hundre KB on your harddisk.

(3) When you write new software for dos, I see no real reason not
    to use dos commands in that case.

Morten Welinder
terra AT diku DOT dk

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