--- opal-3.6.8_orig/include/opal/opalmixer.h	
+++ opal-3.6.8_orig/include/opal/opalmixer.h	
@@ -97,7 +97,7 @@ 
       dataLen = size;
     }
 
-    PMemBuffer(const PBYTEArray & obj)
+    PMemBuffer(PBYTEArray & obj)
     { 
       common = new Common(obj.GetPointer(), obj.GetSize());
       data    = common->base.GetPointer();