diff --git a/src/framework/core/application.h b/src/framework/core/application.h
index fc9944fc..9f57ac34 100644
--- a/src/framework/core/application.h
+++ b/src/framework/core/application.h
@@ -68,8 +68,8 @@ protected:
     std::string m_appCompactName;
     std::string m_appVersion;
     std::string m_startupOptions;
-    bool m_running = false;
-    bool m_stopping = false;
+    stdext::boolean<false> m_running;
+    stdext::boolean<false> m_stopping;
     stdext::boolean<false> m_terminated;
 };
 
diff --git a/src/framework/core/eventdispatcher.h b/src/framework/core/eventdispatcher.h
index dbe3361e..0ff483cd 100644
--- a/src/framework/core/eventdispatcher.h
+++ b/src/framework/core/eventdispatcher.h
@@ -40,7 +40,7 @@ public:
 private:
     std::list<EventPtr> m_eventList;
     int m_pollEventsSize;
-    bool m_disabled = false;
+    stdext::boolean<false> m_disabled;
     std::priority_queue<ScheduledEventPtr, std::vector<ScheduledEventPtr>, lessScheduledEvent> m_scheduledEventList;
 };
 
diff --git a/src/framework/core/graphicalapplication.h b/src/framework/core/graphicalapplication.h
index 2feadc82..3fc4fc9f 100644
--- a/src/framework/core/graphicalapplication.h
+++ b/src/framework/core/graphicalapplication.h
@@ -60,8 +60,8 @@ protected:
     void inputEvent(const InputEvent& event);
 
 private:
-    bool m_onInputEvent = false;
-    bool m_mustRepaint = false;
+    stdext::boolean<false> m_onInputEvent;
+    stdext::boolean<false> m_mustRepaint;
     AdaptativeFrameCounter m_backgroundFrameCounter;
     AdaptativeFrameCounter m_foregroundFrameCounter;
     TexturePtr m_foreground;
diff --git a/src/framework/core/module.h b/src/framework/core/module.h
index 75c4b26b..bf3eb866 100644
--- a/src/framework/core/module.h
+++ b/src/framework/core/module.h
@@ -63,10 +63,10 @@ protected:
     friend class ModuleManager;
 
 private:
-    bool m_loaded = false;
-    bool m_autoLoad = false;
-    bool m_reloadable = false;
-    bool m_sandboxed = false;
+    stdext::boolean<false> m_loaded;
+    stdext::boolean<false> m_autoLoad;
+    stdext::boolean<false> m_reloadable;
+    stdext::boolean<false> m_sandboxed;
     int m_autoLoadPriority;
     int m_sandboxEnv;
     std::tuple<std::string, std::string> m_onLoadFunc;
diff --git a/src/framework/core/resourcemanager.h b/src/framework/core/resourcemanager.h
index d970899c..89a39f05 100644
--- a/src/framework/core/resourcemanager.h
+++ b/src/framework/core/resourcemanager.h
@@ -72,7 +72,7 @@ public:
 private:
     std::string m_workDir;
     std::string m_writeDir;
-    bool m_hasSearchPath = false;
+    stdext::boolean<false> m_hasSearchPath;
     std::deque<std::string> m_searchPaths;
 };
 
diff --git a/src/framework/core/timer.h b/src/framework/core/timer.h
index fe338cb1..5a2b82c1 100644
--- a/src/framework/core/timer.h
+++ b/src/framework/core/timer.h
@@ -41,7 +41,7 @@ public:
 
 private:
     ticks_t m_startTicks;
-    bool m_stopped = false;
+    stdext::boolean<false> m_stopped;
 };
 
 #endif
diff --git a/src/framework/graphics/cachedtext.h b/src/framework/graphics/cachedtext.h
index 7fed574f..4db2f07b 100644
--- a/src/framework/graphics/cachedtext.h
+++ b/src/framework/graphics/cachedtext.h
@@ -48,7 +48,7 @@ private:
 
     std::string m_text;
     Size m_textSize;
-    bool m_textMustRecache = true;
+    stdext::boolean<true> m_textMustRecache;
     CoordsBuffer m_textCoordsBuffer;
     Rect m_textCachedScreenCoords;
     BitmapFontPtr m_font;
diff --git a/src/framework/graphics/framebuffer.h b/src/framework/graphics/framebuffer.h
index 22c24303..4645313f 100644
--- a/src/framework/graphics/framebuffer.h
+++ b/src/framework/graphics/framebuffer.h
@@ -61,8 +61,8 @@ private:
     Size m_oldViewportSize;
     uint m_fbo;
     uint m_prevBoundFbo;
-    bool m_backuping = true;
-    bool m_smooth = true;
+    stdext::boolean<true> m_backuping;
+    stdext::boolean<true> m_smooth;
 
     static uint boundFbo;
 };
diff --git a/src/framework/graphics/graphics.h b/src/framework/graphics/graphics.h
index f02521a7..c817c659 100644
--- a/src/framework/graphics/graphics.h
+++ b/src/framework/graphics/graphics.h
@@ -77,16 +77,16 @@ private:
 
     int m_maxTextureSize;
     int m_alphaBits;
-    bool m_ok = false;
-    bool m_useDrawArrays = true;
-    bool m_useFBO = true;
-    bool m_useHardwareBuffers = false;
-    bool m_useBilinearFiltering = true;
-    bool m_useNonPowerOfTwoTextures = true;
-    bool m_useMipmaps = true;
-    bool m_useHardwareMipmaps = true;
-    bool m_useClampToEdge = true;
-    bool m_cacheBackbuffer = true;
+    stdext::boolean<false> m_ok;
+    stdext::boolean<true> m_useDrawArrays;
+    stdext::boolean<true> m_useFBO;
+    stdext::boolean<false> m_useHardwareBuffers;
+    stdext::boolean<true> m_useBilinearFiltering;
+    stdext::boolean<true> m_useNonPowerOfTwoTextures;
+    stdext::boolean<true> m_useMipmaps;
+    stdext::boolean<true> m_useHardwareMipmaps;
+    stdext::boolean<true> m_useClampToEdge;
+    stdext::boolean<true> m_cacheBackbuffer;
     PainterEngine m_prefferedPainterEngine;
     PainterEngine m_selectedPainterEngine;
 };
diff --git a/src/framework/graphics/painterogl1.h b/src/framework/graphics/painterogl1.h
index 995eebcd..0d0bc1d0 100644
--- a/src/framework/graphics/painterogl1.h
+++ b/src/framework/graphics/painterogl1.h
@@ -72,7 +72,7 @@ private:
     void updateGlTextureState();
 
     GLenum m_matrixMode;
-    bool m_textureEnabled = false;
+    stdext::boolean<false> m_textureEnabled;
 };
 
 extern PainterOGL1 *g_painterOGL1;
diff --git a/src/framework/graphics/texture.h b/src/framework/graphics/texture.h
index e87b3607..6498183c 100644
--- a/src/framework/graphics/texture.h
+++ b/src/framework/graphics/texture.h
@@ -63,10 +63,10 @@ protected:
     Size m_size;
     Size m_glSize;
     Matrix3 m_transformMatrix;
-    bool m_hasMipmaps = false;
-    bool m_smooth = false;
-    bool m_upsideDown = false;
-    bool m_repeat = false;
+    stdext::boolean<false> m_hasMipmaps;
+    stdext::boolean<false> m_smooth;
+    stdext::boolean<false> m_upsideDown;
+    stdext::boolean<false> m_repeat;
 };
 
 #endif
diff --git a/src/framework/platform/platformwindow.h b/src/framework/platform/platformwindow.h
index df9af277..989af504 100644
--- a/src/framework/platform/platformwindow.h
+++ b/src/framework/platform/platformwindow.h
@@ -111,11 +111,11 @@ protected:
     InputEvent m_inputEvent;
     stdext::boolean<false> m_mouseButtonStates[4];
 
-    bool m_created = false;
-    bool m_visible = false;
-    bool m_focused = false;
-    bool m_fullscreen = false;
-    bool m_maximized = false;
+    stdext::boolean<false> m_created;
+    stdext::boolean<false> m_visible;
+    stdext::boolean<false> m_focused;
+    stdext::boolean<false> m_fullscreen;
+    stdext::boolean<false> m_maximized;
 
     std::function<void()> m_onClose;
     OnResizeCallback m_onResize;
diff --git a/src/framework/sound/soundmanager.h b/src/framework/sound/soundmanager.h
index 7a9c2108..b5b3a78f 100644
--- a/src/framework/sound/soundmanager.h
+++ b/src/framework/sound/soundmanager.h
@@ -61,8 +61,8 @@ private:
     SoundSourcePtr m_musicSource;
     ALCdevice *m_device;
     ALCcontext *m_context;
-    bool m_musicEnabled = false;
-    bool m_soundEnabled = false;
+    stdext::boolean<false> m_musicEnabled;
+    stdext::boolean<false> m_soundEnabled;
     std::string m_currentMusic;
 };
 
diff --git a/src/framework/sound/streamsoundsource.h b/src/framework/sound/streamsoundsource.h
index 86c2143d..8c9fc693 100644
--- a/src/framework/sound/streamsoundsource.h
+++ b/src/framework/sound/streamsoundsource.h
@@ -56,7 +56,7 @@ private:
     SoundFilePtr m_soundFile;
     std::array<SoundBufferPtr,STREAM_FRAGMENTS> m_buffers;
     DownMix m_downMix;
-    bool m_looping = false;
+    stdext::boolean<false> m_looping;
 };
 
 #endif
diff --git a/src/framework/stdext/attrib_storage.h b/src/framework/stdext/attrib_storage.h
index 029029bc..d203573c 100644
--- a/src/framework/stdext/attrib_storage.h
+++ b/src/framework/stdext/attrib_storage.h
@@ -34,6 +34,7 @@
 namespace stdext {
 class attrib_storage {
 public:
+    attrib_storage() : m_attribs(nullptr), m_size(0) { }
     ~attrib_storage() { if(m_attribs) delete[] m_attribs; }
 
     template<typename T>
@@ -74,8 +75,8 @@ public:
     }
 
 private:
-    std::tuple<uint8, boost::any>* m_attribs = nullptr;
-    uint8 m_size = 0;
+    std::tuple<uint8, boost::any>* m_attribs;
+    uint8 m_size;
 };
 
 // restore memory alignment
diff --git a/src/framework/stdext/compiler.h b/src/framework/stdext/compiler.h
index e09521c9..061dcf7a 100644
--- a/src/framework/stdext/compiler.h
+++ b/src/framework/stdext/compiler.h
@@ -27,8 +27,8 @@
     // clang is supported
     #undef _GLIBCXX_USE_FLOAT128
 #elif defined(__GNUC__)
-    #if !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
-    #error "Sorry, you need gcc 4.7 or greater to compile."
+    #if !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
+    #error "Sorry, you need gcc 4.6 or greater to compile."
     #endif
 #else
     #error "Compiler not supported."
diff --git a/src/framework/ui/uiboxlayout.h b/src/framework/ui/uiboxlayout.h
index 9965c1c3..833d019b 100644
--- a/src/framework/ui/uiboxlayout.h
+++ b/src/framework/ui/uiboxlayout.h
@@ -41,7 +41,7 @@ public:
     bool isUIBoxLayout() { return true; }
 
 protected:
-    bool m_fitChildren = false;
+    stdext::boolean<false> m_fitChildren;
     int m_spacing;
 };
 
diff --git a/src/framework/ui/uigridlayout.h b/src/framework/ui/uigridlayout.h
index 7d299c73..6891ee7f 100644
--- a/src/framework/ui/uigridlayout.h
+++ b/src/framework/ui/uigridlayout.h
@@ -55,9 +55,9 @@ private:
     int m_cellSpacing;
     int m_numColumns;
     int m_numLines;
-    bool m_autoSpacing = false;
-    bool m_fitChildren = false;
-    bool m_flow = false;
+    stdext::boolean<false> m_autoSpacing;
+    stdext::boolean<false> m_fitChildren;
+    stdext::boolean<false> m_flow;
 };
 
 #endif
diff --git a/src/framework/ui/uihorizontallayout.h b/src/framework/ui/uihorizontallayout.h
index a23a1fcf..d7410d66 100644
--- a/src/framework/ui/uihorizontallayout.h
+++ b/src/framework/ui/uihorizontallayout.h
@@ -39,7 +39,7 @@ public:
 protected:
     bool internalUpdate();
 
-    bool m_alignRight = false;
+    stdext::boolean<false> m_alignRight;
 };
 
 #endif
diff --git a/src/framework/ui/uilayout.h b/src/framework/ui/uilayout.h
index 5187e559..25e7dd6a 100644
--- a/src/framework/ui/uilayout.h
+++ b/src/framework/ui/uilayout.h
@@ -58,8 +58,8 @@ protected:
     virtual bool internalUpdate() = 0;
 
     int m_updateDisabled;
-    bool m_updating = false;
-    bool m_updateScheduled = false;
+    stdext::boolean<false> m_updating;
+    stdext::boolean<false> m_updateScheduled;
     UIWidgetPtr m_parentWidget;
 };
 
diff --git a/src/framework/ui/uimanager.h b/src/framework/ui/uimanager.h
index 31f63ba4..2c25ef93 100644
--- a/src/framework/ui/uimanager.h
+++ b/src/framework/ui/uimanager.h
@@ -82,8 +82,8 @@ private:
     UIWidgetPtr m_draggingWidget;
     UIWidgetPtr m_hoveredWidget;
     UIWidgetPtr m_pressedWidget;
-    bool m_hoverUpdateScheduled = false;
-    bool m_drawDebugBoxes = false;
+    stdext::boolean<false> m_hoverUpdateScheduled;
+    stdext::boolean<false> m_drawDebugBoxes;
     std::unordered_map<std::string, OTMLNodePtr> m_styles;
     UIWidgetList m_destroyedWidgets;
     ScheduledEventPtr m_checkEvent;
diff --git a/src/otclient/creatures.cpp b/src/otclient/creatures.cpp
index e7276617..091969e6 100644
--- a/src/otclient/creatures.cpp
+++ b/src/otclient/creatures.cpp
@@ -98,6 +98,7 @@ bool Creatures::m_loadCreatureBuffer(TiXmlElement* attrib, const CreatureTypePtr
         return true;
 
     Outfit out;
+    out.setCategory(ThingCategoryCreature);
     int32 type;
     if(!attrib->Attribute("type").empty())
         type = attrib->readType<int32>("type");
diff --git a/src/otclient/map.cpp b/src/otclient/map.cpp
index 0c60380b..68da1704 100644
--- a/src/otclient/map.cpp
+++ b/src/otclient/map.cpp
@@ -122,7 +122,7 @@ void Map::loadOtbm(const std::string& fileName)
             setHouseFile(fileName.substr(0, fileName.rfind('/') + 1) + tmp);
             break;
         default:
-            stdext::throw_exception(stdext::format("Invalid attribute '%c'", attribute));
+            stdext::throw_exception(stdext::format("Invalid attribute '%d'", (int)attribute));
         }
     }
 
diff --git a/src/otclient/map.h b/src/otclient/map.h
index 7d3cf4d1..31d2be6c 100644
--- a/src/otclient/map.h
+++ b/src/otclient/map.h
@@ -129,7 +129,6 @@ enum clientVersion_t
     CLIENT_VERSION_960 = 40
 };
 
-
 enum {
     OTCM_SIGNATURE = 0x4D43544F,
     OTCM_VERSION = 1