[3.3.11] pbm running ddd with dbx on AIX 5.3

Hello,

I try to use DDD 3.3.11 on an IBM p575 system running AIX 5.3 with  
dbx as inferior debugger.
The problem is that ddd waits for dbx to get ready.
I have this problem with the "sample.c" example given in "Chapter 1 :  
a sample DDD session" of the DDD manual.

I have to set the LD_LIBRARY_PATH environment variable to make DDD  
work (see below)

Here are some informations about the system :

AIX
===
this is AIX 5.3 ML 04.
oslevel -r
5300-04

DBX
===
dbx is shipped with AIX 5.3 as one can get :
which_fileset dbx
/usr/bin/dbx -> /usr/ccs/bin/dbx        bos.adt.debug 5.3.0.0
/usr/ccs/bin/dbx                        bos.adt.debug 5.3.0.0

Compiling sample code
=====================
xlc -O0 -g -qfullpath sample.c -o sample




DDD
===

Configuration
=============
/usr/local/bin/ddd --configuration
GNU DDD 3.3.11 (powerpc-ibm-aix5.3.0.0)
Copyright (C) 1995-1999 Technische Universit‰t Braunschweig, Germany.
Copyright (C) 1999-2001 Universit‰t Passau, Germany.
Copyright (C) 2001 Universit‰t des Saarlandes, Germany.
Copyright (C) 2001-2004 Free Software Foundation, Inc.

Compiled with GCC 4.0.2
Requires X11R6, Xt11R6, Motif 2.1.30 (Motif Version 2.1.30)
Includes Athena Panner, DDD core
Built 2006-02-25 by root <[email protected]>.

Check configuration
===================
usr/local/bin/ddd --check-configuration
Checking for X11 library directory... /usr/lib/X11
Checking for XKeysymDB... /usr/lib/X11/XKeysymDB
No configuration problems found.

Launching DDD
=============
/usr/local/bin/ddd --trace --debugger dbx sample
exec(): 0509-036 Cannot load program /usr/local/bin/ddd because of  
the following errors:
         0509-150   Dependent module libstdc++.a(libstdc++.so.6)  
could not be loaded.
         0509-022 Cannot load module libstdc++.a(libstdc++.so.6).
         0509-026 System error: A file or directory in the path name  
does not exist.

setenv LD_LIBRARY_PATH /usr/local/lib

/usr/local/bin/ddd --trace --debugger dbx sample
GM-PWR5 % GNU DDD 3.3.11 (powerpc-ibm-aix5.3.0.0)
Copyright (C) 1995-1999 Technische Universit‰t Braunschweig, Germany.
Copyright (C) 1999-2001 Universit‰t Passau, Germany.
Copyright (C) 2001 Universit‰t des Saarlandes, Germany.
Copyright (C) 2001-2004 Free Software Foundation, Inc.

Compiled with GCC 4.0.2
Requires X11R6, Xt11R6, Motif 2.1.30 (Motif Version 2.1.30)
Includes Athena Panner, DDD core
Built 2006-02-25 by root <[email protected]>.
$  /usr/local/bin/ddd --trace --debugger dbx sample
+  /bin/sh -c 'exec dbx '\''sample'\'''
#  Hello, world!
#  Starting DBX...
#  Raising core file size limit from 2147483645 to 2147483647 bytes...
#  Raising core file size limit from 2147483645 to 2147483647  
bytes...done.
#  Running DBX (pid 1077462, tty /dev/pts/11)...
#  Current language: C/C++
#  Searching "vsllib/ddd.vsl"...
#  Trying "/home/crihan/gm/.ddd/vsllib/ddd.vsl"
#  Trying "/usr/local/share/ddd-3.3.11/vsllib/ddd.vsl"
#  Searching "vsllib/ddd.vsl"..."/usr/local/share/ddd-3.3.11/vsllib/ 
ddd.vsl".
2006.09.27 10:52:59
<- "Type \'help\' for help.\n"
2006.09.27 10:52:59
<- "reading symbolic information ...\n"
#  Open Program: waiting until DBX gets ready...


==>  And then nothing happens .
After ten minutes, I select the "File => Exit" option and I get :

#  Saving options in "/home/crihan/gm/.ddd/init"...
#  Saving options in "/home/crihan/gm/.ddd/init"...done.
/bin/sh -c 'exec dbx '\''sample'\''' [1077462]: Hangup
#  Thanks for using DDD 3.3.11!

Did someone face the same problem ?
Is there something I have to set somewhere ?

Thank you for your help.

Regards,