call erlexec in GDB properly (voidlinux)

erlang GDB on Void

#!/bin/sh
#
# %CopyrightBegin%
#
# Copyright Ericsson AB 1996-2012. All Rights Reserved.
#
# The contents of this file are subject to the Erlang Public License,
# Version 1.1, (the "License"); you may not use this file except in
# compliance with the License. You should have received a copy of the
# Erlang Public License along with this software. If not, it can be
# retrieved online at http://www.erlang.org/.
#
# Software distributed under the License is distributed on an "AS IS"
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
# the License for the specific language governing rights and limitations
# under the License.
#
# %CopyrightEnd%
#
ROOTDIR="/usr/lib/erlang"
BINDIR=$ROOTDIR/erts-8.0/bin
EMU=beam
PROGNAME=`echo $0 | sed 's/.*\///'`
export EMU
export ROOTDIR
export BINDIR 
export PROGNAME 

# export USE_GDB=1 in the shell to run erlang under the gdb debugger
# this is useful for debugging nifs
if [ ! -z "$USE_GDB" ]; then
  gdb --args $BINDIR/erlexec ${1+"$@"}
else
  exec $BINDIR/erlexec ${1+"$@"}
fi