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From: Chuck Swiger <cswiger@mac.com>
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Date: Tue, 24 May 2011 12:48:58 -0700
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To: Helmut Schneider <jumper99@gmx.de>
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Subject: Re: ${CD}
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On May 24, 2011, at 12:39 PM, Helmut Schneider wrote:
> I need 'cd' in my Makefile. It seems that the variable ${CD} is not
> defined and people are using 'cd' instead.
> 
> Is there a certain reason for that?

make isn't the same as a shell; while you can do shell one-liners starting with a 'cd' if you have to, they won't have any effect on subsequent Makefile statements.  Consider using VPATH to find sources instead.

Regards,
-- 
-Chuck