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Problem with new bash "exec" shell script command on PPC

The following shell script behave incorrectly with the last bash
package. It correctly build the makefile but then instead of
exiting it continue to execute I wonder what.

NB : replacing #!/bin/sh to #!/usr/bin/ksh fix the problem so I'm pretty 
   sure it comes from bash.
NB2 : the old PPC bash package did not exibit this problem...

-------------------------------- Info on current install -------------------
bash --version
GNU bash, version 2.02.1(1)-release (powerpc-unknown-linux-gnu)
Copyright 1998 Free Software Foundation, Inc.
dpkg -s bash 
Package: bash
Essential: yes
Status: install ok installed
Priority: required
Section: base
Installed-Size: 850
Maintainer: Guy Maor <maor@debian.org>
Version: 2.02.1-1.4
Pre-Depends: libc6 (>= 2.1), libncurses4 (>= 4.2-3.1), libreadlineg2 (>= 2.1-13.1)
 /etc/profile db431f071e29c47666be4117325e641d
 /etc/skel/.bash_profile 7fb37112e03e428ceb7755b36bd08a42
 /etc/skel/.bashrc 118f882acfaf472e6a352b1baaf5db87
Description: The GNU Bourne Again SHell
 Bash is an sh-compatible command language interpreter that executes
 commands read from the standard input or from a file.  Bash also
 incorporates useful features from the Korn and C shells (ksh and csh).
 Bash is ultimately intended to be a conformant implementation of the
 IEEE Posix Shell and Tools specification (IEEE Working Group 1003.2).
uname -a 
Linux ppc1target 2.2.3 #61 Fri Apr 2 14:43:15 CEST 1999 ppc unknown

---------------- Shell script -----------------------------
echo imake -DUseInstalled -I$MERGEDIR/dtool/imake -DClassiXDir=$MERGEDIR \
	-DImakeDefines="-DClassiXDir=$MERGEDIR" -s $MAKEFILE
exec imake -DUseInstalled -I$MERGEDIR/dtool/imake -DClassiXDir=$MERGEDIR \
	-DImakeDefines="-DClassiXDir=$MERGEDIR" -s $MAKEFILE

  /  `                   	Eric Valette
 /--   __  o _.          	Canon CRF
(___, / (_(_(__         	Rue de la touche lambert
				35517 Cesson-Sevigne  Cedex
Tel: +33 (0)2 99 87 68 91	Fax: +33 (0)2 99 84 11 30
E-mail: valette@crf.canon.fr

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