diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1fbeb363..1d023469 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,7 +142,11 @@ endif()
 #
 if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
     if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-        set(CMAKE_CXX_FLAGS "-std=gnu++14 -Wall")
+	if("${CMAKE_SYSTEM_NAME}" MATCHES "FreeBSD")
+            set(CMAKE_CXX_FLAGS "-std=gnu++14 -Wall -I/usr/local/include")
+	else()
+	    set(CMAKE_CXX_FLAGS "-std=gnu++14 -Wall")
+	endif()
     else()
         set(CMAKE_CXX_FLAGS "-std=c++14 -Wall")
     endif()
diff --git a/include/nana/gui/widgets/listbox.hpp b/include/nana/gui/widgets/listbox.hpp
index 3f2caab6..1fe6aeca 100644
--- a/include/nana/gui/widgets/listbox.hpp
+++ b/include/nana/gui/widgets/listbox.hpp
@@ -1541,7 +1541,7 @@ the nana::detail::basic_window member pointer scheme
 		nana::any* _m_anyobj(size_type cat, size_type index, bool allocate_if_empty) const override;
 		drawerbase::listbox::category_t* _m_assoc(std::shared_ptr<nana::detail::key_interface>, bool create_if_not_exists);
 		void _m_erase_key(nana::detail::key_interface*) noexcept;
-		std::shared_ptr<scroll_operation_interface> _m_scroll_operation();
+		std::shared_ptr<scroll_operation_interface> _m_scroll_operation() override;
 	};
 }//end namespace nana
 
diff --git a/include/nana/gui/widgets/textbox.hpp b/include/nana/gui/widgets/textbox.hpp
index de70728c..4a2663ae 100644
--- a/include/nana/gui/widgets/textbox.hpp
+++ b/include/nana/gui/widgets/textbox.hpp
@@ -279,7 +279,7 @@ namespace nana
 		native_string_type _m_caption() const throw() override;
 		void _m_caption(native_string_type&&) override;
 		void _m_typeface(const paint::font&) override;
-		std::shared_ptr<scroll_operation_interface> _m_scroll_operation() const;
+		std::shared_ptr<scroll_operation_interface> _m_scroll_operation() override;
 	};
 }//end namespace nana
 #include <nana/pop_ignore_diagnostic>
diff --git a/include/nana/gui/widgets/treebox.hpp b/include/nana/gui/widgets/treebox.hpp
index 75be5da0..671851c2 100644
--- a/include/nana/gui/widgets/treebox.hpp
+++ b/include/nana/gui/widgets/treebox.hpp
@@ -446,7 +446,7 @@ namespace nana
 		item_proxy selected() const; ///< returns the selected node
 
 	private:
-		std::shared_ptr<scroll_operation_interface> _m_scroll_operation() const;
+		std::shared_ptr<scroll_operation_interface> _m_scroll_operation() override;
 
 	};//end class treebox
 }//end namespace nana
diff --git a/source/gui/place.cpp b/source/gui/place.cpp
index f8fb949a..5a9982c6 100644
--- a/source/gui/place.cpp
+++ b/source/gui/place.cpp
@@ -2583,8 +2583,9 @@ namespace nana
 		: public division
 	{
 	public:
-		div_switchable(std::string && name, implement* impl) noexcept
-			: division(kind::switchable, std::move(name)), impl_(impl)
+		div_switchable(std::string && name, implement* /*impl*/) noexcept:
+			division(kind::switchable, std::move(name))//,
+			//impl_(impl) 	//deprecated
 		{}
 	private:
 		void collocate(window wd) override
@@ -2613,7 +2614,7 @@ namespace nana
 			}
 		}
 	private:
-		implement * const impl_;
+		//implement * const impl_; //deprecated
 	};
 
 	place::implement::~implement()
diff --git a/source/gui/widgets/textbox.cpp b/source/gui/widgets/textbox.cpp
index 265a8e28..2fbc9290 100644
--- a/source/gui/widgets/textbox.cpp
+++ b/source/gui/widgets/textbox.cpp
@@ -817,7 +817,7 @@ namespace drawerbase {
 				editor->reset_caret_pixels();
 		}
 
-		std::shared_ptr<scroll_operation_interface> textbox::_m_scroll_operation() const
+		std::shared_ptr<scroll_operation_interface> textbox::_m_scroll_operation()
 		{
 			internal_scope_guard lock;
 			auto editor = get_drawer_trigger().editor();
diff --git a/source/gui/widgets/treebox.cpp b/source/gui/widgets/treebox.cpp
index 4dcf0d57..19873e27 100644
--- a/source/gui/widgets/treebox.cpp
+++ b/source/gui/widgets/treebox.cpp
@@ -2234,7 +2234,7 @@ namespace nana
 			return item_proxy(const_cast<drawer_trigger_t*>(&get_drawer_trigger()), get_drawer_trigger().selected());
 		}
 
-		std::shared_ptr<scroll_operation_interface> treebox::_m_scroll_operation() const
+		std::shared_ptr<scroll_operation_interface> treebox::_m_scroll_operation()
 		{
 			internal_scope_guard lock;
 			return std::make_shared<drawerbase::treebox::exclusive_scroll_operation>(get_drawer_trigger().impl()->shape.scroll);