Symbol @SHELL@ in Makefiles

[Werner Modenbach]

Is there anybody out there who can tell me why I allways get the line

SHELL = @SHELL@

in Makefile and Makefile.in

If I edit this to be 
SHELL = /bin/sh 
everything works fine until the next Build -> cleanup/rebuild all

(sorry if this is not the correct naming of menu entries - I'm using a German version)
(Erstellen -> Säubern/Alles neu erstellen)

This will change my Makefiles back to
SHELL = @SHELL@

Hoping for help :-))

- Werner -

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Werner Modenbach		 modenbach at alc.de
ALC Computertechnik GmbH	 http://www.alc.de