diff --git a/src/include/base/isq.h b/src/include/base/isq.h
index b4d77c3..5cc6353 100644
--- a/src/include/base/isq.h
+++ b/src/include/base/isq.h
@@ -9,7 +9,7 @@
 namespace CNORXZ
 {
     template <SizeT O, SizeT... Is>
-    std::index_sequence<(Is+O)...> mkIsqAdd(std::index_sequence<is...> is) { return {}; }
+    std::index_sequence<(Is+O)...> mkIsqAdd(std::index_sequence<Is...> is) { return {}; }
 
     template <SizeT B, SizeT E>
     struct MkIsq
@@ -17,14 +17,14 @@ namespace CNORXZ
 	static auto make()
 	{
 	    static_assert(B <= E, "begin of sequence must be smaller than end of sequence");
-	    return mkIsqAdd<B>( std::make_index_sequence<E-B> );
+	    return mkIsqAdd<B>( std::make_index_sequence<E-B>{} );
 	}
 
 	typedef decltype(make()) type;
     };
     
     template <SizeT B, SizeT E>
-    using Isqr = MkIsq<B,E>::type;
+    using Isqr = typename MkIsq<B,E>::type;
 }
 
 #endif
diff --git a/src/include/base/iter.cc.h b/src/include/base/iter.cc.h
index 8289dad..73c97b7 100644
--- a/src/include/base/iter.cc.h
+++ b/src/include/base/iter.cc.h
@@ -3,7 +3,7 @@
 #define __cxz_iter_cc_h__
 
 #include "iter.h"
-#include "functional/fundamental.h"
+#include "xpr/func.h"
 
 namespace CNORXZ
 {
@@ -11,10 +11,10 @@ namespace CNORXZ
     constexpr decltype(auto) iteri(const G& g, const F& f, Isq<Is...> is)
     {
 	if constexpr(std::is_same<F,NoF>::value){
-	    ( g(std::integral_constant<SizeT,Is>{}, args...), ... );
+	    ( g(std::integral_constant<SizeT,Is>{}), ... );
 	}
 	else {
-	    return f( g(std::integral_constant<SizeT,Is>{}, args...) ... );
+	    return f( g(std::integral_constant<SizeT,Is>{}) ... );
 	}
     }
 
diff --git a/src/include/base/types.h b/src/include/base/types.h
index 07c288f..62053cb 100644
--- a/src/include/base/types.h
+++ b/src/include/base/types.h
@@ -45,7 +45,7 @@ namespace CNORXZ
     using TupleElem = std::tuple_element<I,Tuple<T...>>;
 
     template <typename T>
-    using RemoveRef = std::remove_reference<T>::type;
+    using RemoveRef = typename std::remove_reference<T>::type;
     
     template <typename K, typename V>
     using Map = std::map<K,V>;
diff --git a/src/include/functional/fundamental.h b/src/include/functional/fundamental.h
deleted file mode 100644
index 9a7d707..0000000
--- a/src/include/functional/fundamental.h
+++ /dev/null
@@ -1,15 +0,0 @@
-
-#ifndef __cxz_fundamental_h__
-#define __cxz_fundamental_h__
-
-#include <cstdlib>
-
-namespace CNORXZ
-{
-    struct NoF
-    {
-	constexpr void operator()() const {};
-    };
-}
-
-#endif
diff --git a/src/include/xpr/pos_type.cc.h b/src/include/xpr/pos_type.cc.h
index db8c28d..d675474 100644
--- a/src/include/xpr/pos_type.cc.h
+++ b/src/include/xpr/pos_type.cc.h
@@ -176,7 +176,7 @@ namespace CNORXZ
     template <class PosT>
     constexpr decltype(auto) FPos::extend(const PosT& a) const
     {
-	return MPos<FPos,PosT1>(*this,a);
+	return MPos<FPos,PosT>(*this,a);
     }
 
     template <class PosT>