static const gp_Pnt MyDefEnd(1,0,0);
static const gp_Pln MyDefPln(gp_Pnt(0,0,0), gp_Dir(0,0,1));
-static const Standard_ExtCharacter MySummSymbol(0x2211);
+// it is not possible to use 0x2211 as summ symbol because it is not supported by
+// debian Linux platform
+static const Standard_ExtCharacter MySummSymbol(0x03A3);
IMPLEMENT_STANDARD_HANDLE(SketcherPrs_LengthDimension, AIS_LengthDimension);
IMPLEMENT_STANDARD_RTTIEXT(SketcherPrs_LengthDimension, AIS_LengthDimension);