explicit not available for conversion operators in Linux yet

indra/llcommon/llhandle.h

@@ -271,7 +271,7 @@ class LLCheckedHandle: public LLCheckedHandleBase
      * Converts the LLCheckedHandle to a bool. Allows for if (chkdHandle) {} 
      * Does not throw.
      */
-    explicit operator bool() const
+    /*explicit*/ operator bool() const // explicit conversion operator not available with Linux compiler
     {
         return (mHandle.get() != NULL);
     }