--- a/include/cxxtools/iostream.h
+++ b/include/cxxtools/iostream.h
@@ -56,7 +56,7 @@ class BasicIStream : public std::basic_i
         {
             BasicStreamBuffer<CharT>* tmp = _buffer;
             _buffer = buffer;
-            rdbuf(buffer);
+            this->rdbuf(buffer);
             return tmp;
         }
 
@@ -106,7 +106,7 @@ class BasicOStream : public std::basic_o
         {
             BasicStreamBuffer<CharT>* tmp = _buffer;
             _buffer = buffer;
-            rdbuf(buffer);
+            this->rdbuf(buffer);
             return tmp;
         }
 
@@ -152,7 +152,7 @@ class BasicIOStream : public std::basic_
         {
             BasicStreamBuffer<CharT>* tmp = _buffer;
             _buffer = buffer;
-            rdbuf(buffer);
+            this->rdbuf(buffer);
             return tmp;
         }
 
--- a/include/cxxtools/textstream.h
+++ b/include/cxxtools/textstream.h
@@ -84,14 +84,14 @@ class BasicTextIStream : public std::bas
         : std::basic_istream<intern_type>(0)
         , _buffer( &is, codec )
         {
-            init(&_buffer);
+            this->init(&_buffer);
         }
 
         explicit BasicTextIStream(CodecType* codec)
         : std::basic_istream<intern_type>(0)
         , _buffer( 0, codec )
         {
-            init(&_buffer);
+            this->init(&_buffer);
         }
 
         //! @brief Deletes to codec.
@@ -170,12 +170,12 @@ class BasicTextOStream : public std::bas
         BasicTextOStream(StreamType& os, CodecType* codec)
         : std::basic_ostream<intern_type>(0)
         , _buffer( &os , codec )
-        { init(&_buffer); }
+        { this->init(&_buffer); }
 
         explicit BasicTextOStream(CodecType* codec)
         : std::basic_ostream<intern_type>(0)
         , _buffer( 0 , codec )
-        { init(&_buffer); }
+        { this->init(&_buffer); }
 
         //! @brief Deletes to codec.
         ~BasicTextOStream()
@@ -253,12 +253,12 @@ class BasicTextStream : public std::basi
         BasicTextStream(StreamType& ios, CodecType* codec)
         : std::basic_iostream<intern_type>(0)
         , _buffer( &ios, codec)
-        { init(&_buffer); }
+        { this->init(&_buffer); }
 
         explicit BasicTextStream(CodecType* codec)
         : std::basic_iostream<intern_type>(0)
         , _buffer(0, codec)
-        { init(&_buffer); }
+        { this->init(&_buffer); }
 
         //! @brief Deletes the codec.
         ~BasicTextStream()
--- a/include/cxxtools/streamcounter.h
+++ b/include/cxxtools/streamcounter.h
@@ -69,7 +69,7 @@ namespace cxxtools
       BasicStreamcounter()
         : std::basic_ostream<CharType, Traits>(0)
       {
-        init(&streambuf);
+        this->init(&streambuf);
       }
 
       unsigned getCount() const           { return streambuf.getCount(); }
--- a/include/cxxtools/smartptr.h
+++ b/include/cxxtools/smartptr.h
@@ -249,14 +249,14 @@ namespace cxxtools
         { ownershipPolicyType::link(ptr, ptr.object); }
       ~SmartPtr()
         { if (ownershipPolicyType::unlink(object))
-            destroy(object); }
+            this->destroy(object); }
 
       SmartPtr& operator= (const SmartPtr& ptr)
       {
         if (object != ptr.object)
         {
           if (ownershipPolicyType::unlink(object))
-            destroy(object);
+            this->destroy(object);
 
           object = ptr.object;
 
--- a/include/cxxtools/query_params.h
+++ b/include/cxxtools/query_params.h
@@ -231,7 +231,7 @@ class QueryParams
       : unnamed_params(src.unnamed_params),
         named_params(src.named_params),
         parent(src.parent),
-        use_parent_values(use_parent_values)
+        use_parent_values(src.use_parent_values)
     { }
 
     /// returns the parent-object
@@ -332,8 +332,15 @@ class QueryParams
     //
 
     /// get named parameter.
+#if 0 // XXX this will return a temporary object for def with clang
     const string& param(const string& name, size_type n = 0,
       const string& def = std::string()) const
+#else
+    static const std::string emptystring;
+
+    const string& param(const string& name, size_type n = 0,
+      const string& def = emptystring) const
+#endif
     {
       named_params_type::const_iterator i = named_params.find(name);
       if (i != named_params.end() && n < i->second.size())
--- a/src/query_params.cpp
+++ b/src/query_params.cpp
@@ -164,6 +164,10 @@ void _parse_url(
   }
 }
 
+#if 1 // XXX clang problem, see query_params.h
+const std::string QueryParams::emptystring;
+#endif
+
 void QueryParams::parse_url(const std::string& url)
 {
   _parse_url(url.begin(), url.end(), unnamed_params, named_params);