diff -up gdl-0.9.7/src/specializations.hpp.gcc6 gdl-0.9.7/src/specializations.hpp
--- gdl-0.9.7/src/specializations.hpp.gcc6	2015-08-24 15:26:47.000000000 -0600
+++ gdl-0.9.7/src/specializations.hpp	2016-03-03 16:30:46.694379312 -0700
@@ -534,16 +534,6 @@ void Data_<SpDString>::MinMax( DLong* mi
 
 // default_io.cpp
 template<>  
-std::istream& operator>>(std::istream& i, Data_<SpDFloat>& data_); 
-template<>  
-std::istream& operator>>(std::istream& i, Data_<SpDDouble>& data_); 
-template<>  
-std::istream& operator>>(std::istream& i, Data_<SpDComplex>& data_); 
-template<>  
-std::istream& operator>>(std::istream& i, Data_<SpDComplexDbl>& data_); 
-template<>  
-std::istream& operator>>(std::istream& is, Data_<SpDString>& data_); 
-template<>  
 std::ostream& Data_<SpDLong>::ToStream(std::ostream& o, SizeT w, SizeT* actPosPtr); 
 template<>  
 std::ostream& Data_<SpDULong>::ToStream(std::ostream& o, SizeT w, SizeT* actPosPtr);