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--- a/src/bincimapmime/convert.cc
+++ b/src/bincimapmime/convert.cc
@@ -30,8 +30,10 @@
 #include "convert.h"
 #include <string>
 
+#ifndef NO_NAMESPACES
 using namespace ::std;
 using namespace Binc;
+#endif /* NO_NAMESPACES */
 
 //------------------------------------------------------------------------
 BincStream::BincStream(void)