I cannot get OPACS Xm to work.
I tried to get OPACS Xm
working but without success. The output is the following

Constructing Visualization Manager....
Initialising Visualization Manager....
Registering graphics systems....
Error: Shell widget main has zero width and/or height

with this setting of the symbols


#-----------------------------------------------------------------------------
# GEANT4 Stuff
#
export G4SYSTEM=Linux-g++
export G4INSTALL=/soft/geant4.0.1
# Make them shared!
export G4MAKESHLIB=$G4INSTALL/config/makeshlib.sh
export G4USESHLIB=1
# Not needed, it should be the default
# export G4LIB=${G4INSTALL}/lib
# Bigger but safer
export G4DEBUG=1
# Verbose but wiser
# export G4_NO_VERBOSE
export CLHEP_BASE_DIR=/soft/CLHEP
# Use standard STL
export G4USE_STL=1
# Make them shared!
# export G4MAKESHLIB=$G4INSTALL/config/makeshlib.sh
LD_LIBRARY_PATH=$LD_LIBRARY_PATH\:${G4INSTALL}/lib/$G4SYSTEM
LD_LIBRARY_PATH=$LD_LIBRARY_PATH\:${G4INSTALL}/tmp/$G4SYSTEM
LD_LIBRARY_PATH=$LD_LIBRARY_PATH\:/soft/CLHEP/lib
export LD_LIBRARY_PATH

########### OpenGL
export G4VIS_BUILD_OPENGLX_DRIVER=1
export G4VIS_USE_OPENGLX=1
export G4VIS_BUILD_OPENGLXM_DRIVER=1
export G4VIS_USE_OPENGLXM=1
# this I have added
export G4USEMESA=1

export XKEYSYMDB=/usr/lib/X11/XKeysymDB
export OGLHOME=/soft/Mesa-3.1

########## OPACS graphics
export G4VIS_BUILD_OPACS_DRIVER=1
export G4VIS_USE_OPACS=1
export OPACS_HOME=/soft/OpenScientistXm/OPACS
export OPACS_VERSION=v3
export OPACS_SYSTEM=Linux-gxx
export OCONFIG=Linux
. $OPACS_HOME/v3/setup.sh
OPATH="$OPATH $G4INSTALL/source/visualization/test/OPACS"

############ VRML
#export G4VIS_BUILD_VRML_DRIVER=1
#export G4VIS_USE_VRML=1
#export G4VIS_BUILD_VRMLFILE_DRIVER=1
#export G4VIS_USE_VRMLFILE=1

########### Interfaces
export G4UI_BUILD_TERMINAL_SESSION=1
export G4UI_USE_TERMINAL=1
#export G4UI_BUILD_GAG_SESSION=1
#export G4UI_USE_GAG=1
export G4UI_BUILD_XM_SESSION=1
export G4UI_USE_XM=1
export G4UI_BUILD_WO_SESSION=1
export G4UI_USE_WO=1
#export G4UI_BUILD_XAW_SESSION=1
#export G4UI_USE_XAW=1
#
# End GEANT4 Stuff
#-----------------------------------------------------------------------------

The funny thing is that it happens in a piece of code which is quite
clean. G4Xt::getInstance gets called without arguments, and this triggers
a call with dummy arguments. All goes well till the call to
XtRealiseWidget, and this is where the program dies with zero length/width
widget, that it is true, but it seems exactly what the program wanted...
(G4Xt.cc:101). I would be glad if you could forward the problem to the
right person. I also submitted the problem in the normal geant
tracking system. Regards, Carminati