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From: "Robert Riebisch (Robert DOT Riebisch AT arcor DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Obscure (?) Makefile syntax
Date: Sun, 13 Mar 2022 20:10:05 +0100
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Robert Riebisch wrote:

> In a Makefile I found this line:
> copy /B $(DJGPP:\DJGPP.ENV=)\bin\pmodstub.exe+a foo.exe
> 
> This fails with 'Path not found' on my Windows XP system, because it
> resolves to:
> copy /B c:\djgpp\djgpp.env\bin\pmodstub.exe+a foo.exe
> 
> That 'djgpp.env\' is the culprit.
> 
> I mean, it's clear, what this line is intended to do, but I've never
> seen this line before.
> 
> Why does it not work on my system?
> How to make it work? Do I need the change some setting on my system?
> (Yes, I already know how to work around, but I'm curious.)

C. Masloch ("ecm") pointed me to
<https://www.gnu.org/software/make/manual/html_node/Substitution-Refs.html#Substitution-Refs>.

Of course, this works case-sensitive.

When I call 'make DJGPP=C:\DJGPP\DJGPP.ENV' it works fine. :-)

-- 
Robert Riebisch