windows build fixes

SConstruct

@@ -360,6 +360,12 @@ env['SHLIBPREFIX']=''
 
 # Environment with Xerces + wxWidgets
 mainEnv = env.Clone()
+if mainEnv.has_key('XERCESINCLUDE'):
+	mainEnv.Append(CPPPATH=mainEnv['XERCESINCLUDE'])
+if mainEnv.has_key('XERCESLIBDIR'):
+	mainEnv.Append(LIBPATH=mainEnv['XERCESLIBDIR'])
+if mainEnv.has_key('XERCESLIB'):
+	mainEnv.Append(LIBS=mainEnv['XERCESLIB'])
 if mainEnv.has_key('GLLIB'):
 	mainEnv.Append(LIBS=mainEnv['GLLIB'])
 if mainEnv.has_key('GLLIBDIR'):

include/mitsuba/render/shandler.h

@@ -34,7 +34,7 @@ MTS_NAMESPACE_BEGIN
 /**
  * XML parser for mitsuba scene files. Uses Xerces-C and SAX
  */
-class SceneHandler : public HandlerBase {
+class MTS_EXPORT_RENDER SceneHandler : public HandlerBase {
 public:
 	SceneHandler();
 	SceneHandler(const std::map<std::string, std::string> &params,