In between I tied it also with the setting of the envs:
#!/bin/bash
CASROOT=/usr/share/opencascade/6.3.0
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/opencas
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/
export CSF_MDTVFontDirectory=$CASROOT/src/FontMFT/
export CSF_MDTVTexturesDirectory=$CASROOT/src/Textures/
export CSF_UnitsDefinition=$CASROOT/src/UnitsAPI/Units.dat
export CSF_UnitsLexicon=$CASROOT/src/UnitsAPI/Lexi_Expr.dat
export CSF_GraphicShr=/usr/lib/libTKOpenGl.so
export CSF_StandardDefaults=$CASROOT/src/StdResource
export CSF_MDTVFontDirectory=$CASROOT/src/FontMFT
export CSF_LANGUAGE=us
export MMGT_CLEAR=1
export CSF_SHMessage=$CASROOT/src/SHMessage
export CSF_XSMessage=$CASROOT/src/XSMessage
export CSF_MDTVTexturesDirectory=$CASROOT/src/Textures
export CSF_StandardDefaults=$CASROOT/src/StdResource
export CSF_PluginDefaults=$CASROOT/src/XCAFResources
export CSF_XCAFDefaults=$CASROOT/src/XCAFResources
export CSF_UnitsLexicon=$CASROOT/src/UnitsAPI/Lexi_Expr.dat
export CSF_UnitsDefinition=$CASROOT/src/UnitsAPI/Units.dat
export CSF_EXCEPTION_PROMPT=1
export CSF_IGESDefaults=$CASROOT/src/XSTEPResource
export CSF_STEPDefaults=$CASROOT/src/XSTEPResource
But the result is still the same.