newer gcc versions seems to have no problem with that, but while working

with g++-4.1 it complains about this so lets be extra clear

apt-pkg/cacheset.h

@@ -186,7 +186,7 @@ public:									/*{{{*/
 		pkgCache::PkgIterator getPkg(void) const { return *_iter; }
 		inline pkgCache::PkgIterator operator*(void) const { return *_iter; };
 		operator typename Container::iterator(void) const { return _iter; }
-		operator typename PackageContainer<Container>::const_iterator() { return PackageContainer<Container>::const_iterator(_iter); }
+		operator typename PackageContainer<Container>::const_iterator() { return typename PackageContainer<Container>::const_iterator(_iter); }
 		inline iterator& operator++() { ++_iter; return *this; }
 		inline iterator operator++(int) { iterator tmp(*this); operator++(); return tmp; }
 		inline bool operator!=(iterator const &i) const { return _iter != i._iter; };
@@ -506,7 +506,7 @@ public:									/*{{{*/
 		pkgCache::VerIterator getVer(void) const { return *_iter; }
 		inline pkgCache::VerIterator operator*(void) const { return *_iter; };
 		operator typename Container::iterator(void) const { return _iter; }
-		operator typename VersionContainer<Container>::const_iterator() { return VersionContainer<Container>::const_iterator(_iter); }
+		operator typename VersionContainer<Container>::const_iterator() { return typename VersionContainer<Container>::const_iterator(_iter); }
 		inline iterator& operator++() { ++_iter; return *this; }
 		inline iterator operator++(int) { iterator tmp(*this); operator++(); return tmp; }
 		inline bool operator!=(iterator const &i) const { return _iter != i._iter; };

methods/http.cc

@@ -602,7 +602,7 @@ bool ServerState::HeaderLine(string Line)
 	 return true;
 
       Size = strtoull(Val.c_str(), NULL, 10);
-      if (Size == ULLONG_MAX)
+      if (Size >= std::numeric_limits<unsigned long long>::max())
 	 return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
       return true;
    }