Preprocessor stuff for stp and igs serializers

src/serializers/IgesSerializer.h

@@ -21,9 +21,15 @@
 #define IGESSERIALIZER_H
 
 #include "OpenCascadeBasedSerializer.h"
+#include "../ifcparse/IfcLogger.h"
 
 #include <IGESControl_Writer.hxx>
+
+#ifndef HAVE_CONFIG_H
+/// @note this is brittle, but apparently the only way to differentiate OCCT
+/// from OCE. In the latter including this header fails for some versions.
 #include <Interface_Static.hxx>
+#endif
 
 class IgesSerializer : public OpenCascadeBasedSerializer
 {
@@ -45,8 +51,12 @@ public:
 	void setUnitNameAndMagnitude(const std::string& /*name*/, float magnitude) {
 		const char* symbol = getSymbolForUnitMagnitude(magnitude);
 		if (symbol) {
+#ifdef HAVE_CONFIG_H
+			Logger::Warning("Setting IGES units not supported on OCE");
+#else
 			Interface_Static::SetCVal("xstep.cascade.unit", symbol);
 			Interface_Static::SetCVal("write.iges.unit", symbol);
+#endif
 		}
 	}
 };