diff --git a/Build/coreLinux/main.mk b/Build/coreLinux/main.mk
index 25ca1d67..6bf6f72f 100644
--- a/Build/coreLinux/main.mk
+++ b/Build/coreLinux/main.mk
@@ -18,10 +18,6 @@ DESTDIR :=
 PREFIX := /usr/local
 
 # Tools
-GCC := gcc
-GXX := g++
-AR := ar
-LD := ld
 WINDRES := windres
 
 # Overridable settings
@@ -29,6 +25,20 @@ V := 0
 W := 0
 DEBUG := 0
 STATIC := 0
+CLANG := 0
+
+
+ifneq ("$(CLANG)","1")
+	GCC := gcc
+	GXX := g++
+	AR := ar
+	LD := ld
+else
+	GCC := clang
+	GXX := clang++
+	AR := ar
+	LD := ld
+endif
 
 # Quiet command if V is not 1
 ifneq ("$(V)","1")
diff --git a/Sources/libagg/agg-2.4/agg_scanline_u.h b/Sources/libagg/agg-2.4/agg_scanline_u.h
index 5a28ed17..d690f46c 100644
--- a/Sources/libagg/agg-2.4/agg_scanline_u.h
+++ b/Sources/libagg/agg-2.4/agg_scanline_u.h
@@ -344,7 +344,7 @@ namespace agg
 
 
         //--------------------------------------------------------------------
-        scanline32_u8() :
+        scanline32_u8(void) :
             m_min_x(0),
             m_last_x(0x7FFFFFF0),
             m_covers()
@@ -422,17 +422,17 @@ namespace agg
         }
 
         //--------------------------------------------------------------------
-        void reset_spans()
+        void reset_spans(void)
         {
             m_last_x = 0x7FFFFFF0;
             m_spans.remove_all();
         }
 
         //--------------------------------------------------------------------
-        int      y()           const { return m_y; }
-        unsigned num_spans()   const { return m_spans.size(); }
-        const_iterator begin() const { return const_iterator(m_spans); }
-        iterator       begin()       { return iterator(m_spans); }
+        int      y(void)           const { return m_y; }
+        unsigned num_spans(void)   const { return m_spans.size(); }
+        const_iterator begin(void) const { return const_iterator(m_spans); }
+        iterator       begin(void)       { return iterator(m_spans); }
 
     private:
         scanline32_u8(const self_type&);
@@ -464,7 +464,7 @@ namespace agg
         typedef base_type::coord_type coord_type;
 
 
-        scanline32_u8_am() : base_type(), m_alpha_mask(0) {}
+        scanline32_u8_am(void) : scanline_u8(), m_alpha_mask(0) {}
         scanline32_u8_am(const AlphaMask& am) : base_type(), m_alpha_mask(&am) {}
 
         //--------------------------------------------------------------------
diff --git a/Sources/libewol/ewol/Game/GameElement.h b/Sources/libewol/ewol/Game/GameElement.h
index 13e0c5b2..933bbc24 100644
--- a/Sources/libewol/ewol/Game/GameElement.h
+++ b/Sources/libewol/ewol/Game/GameElement.h
@@ -33,6 +33,7 @@
 #include <math.h>
 
 #define CYCLIC_CALL_PERIODE_US     (10000)
+#define NB_SPECIAL_PARAM           (5)
 
 namespace ewol {
 	
@@ -55,6 +56,7 @@ namespace ewol {
 			float              m_size;          //!< Current size of the element more specific size can be done in the under class => this is for simplify calculation ==> all is consider like sphere...
 			bool               m_canBeCibled;   //!< This is for automatic finding on an ennemy
 			bool               m_canHaveImpact; //!< detection of impact is done with this ...
+			float              m_specialParam[NB_SPECIAL_PARAM]; //!< specific game user parameter
 		public:
 			/**
 			 * @brief Constructor : here are requested all the needed sprite and effect that can be used in the game
@@ -109,6 +111,9 @@ namespace ewol {
 			uint16_t GroupGet(void)                               { return m_group; };
 			void     GroupSet(uint16_t state)                     { m_group = state; };
 			
+			float    SpecialParamGet(int32_t id)                  { if (id<0 || id>=NB_SPECIAL_PARAM) {return 0.0;} return m_specialParam[id]; };
+			void     SpecialParamSet(int32_t id, float state)     { if (id<0 || id>=NB_SPECIAL_PARAM) {return;} m_specialParam[id]=state; };
+			
 			/**
 			 * @brief Periodicly this fuction will be call tu change property of all the dynamic obbjects
 			 * @param[in] time Current game time (start at 0)
diff --git a/Sources/libewol/ewol/Game/SceneElement.cpp b/Sources/libewol/ewol/Game/SceneElement.cpp
index 438ac2f8..bb13f6d0 100644
--- a/Sources/libewol/ewol/Game/SceneElement.cpp
+++ b/Sources/libewol/ewol/Game/SceneElement.cpp
@@ -40,7 +40,7 @@ ewol::SceneElement::SceneElement(void)
 	for (int32_t iii=0; iii<MAX_GROUP_NUMBER; iii++) {
 		int32_t kkk = 0;
 		for (int32_t jjj=0; jjj<MAX_GROUP_NUMBER-1; jjj++) {
-			if (jjj == kkk) {
+			if (iii == kkk) {
 				kkk++;
 			}
 			groupEnemy[iii][jjj] = kkk;
@@ -224,14 +224,18 @@ uint32_t ewol::SceneElement::GetNearestEnemy(Vector2D<float> position, int32_t g
 		return 0;
 	}
 	while (groupEnemy[groupId][jjj] != -1) {
-		for (int32_t iii=0; iii<listAnimatedElements[groupEnemy[groupId][jjj]].Size(); iii++) {
-			if (NULL != listAnimatedElements[groupEnemy[groupId][jjj]][iii]) {
-				if (true == listAnimatedElements[groupEnemy[groupId][jjj]][iii]->CanBeCibledGet()) {
-					Vector2D<float> tmpPos = listAnimatedElements[groupEnemy[groupId][jjj]][iii]->PositionGet();
+		int32_t gId = groupEnemy[groupId][jjj];
+		if (gId == groupId) {
+			EWOL_ERROR("groupId=" << gId << " is ennemy of groupId:" << groupId);
+		}
+		for (int32_t iii=0; iii<listAnimatedElements[gId].Size(); iii++) {
+			if (NULL != listAnimatedElements[gId][iii]) {
+				if (true == listAnimatedElements[gId][iii]->CanBeCibledGet()) {
+					Vector2D<float> tmpPos = listAnimatedElements[gId][iii]->PositionGet();
 					float distance = quadDist(position, tmpPos);
 					if (distance <= lastQuadDistance) {
 						lastQuadDistance = distance;
-						result = createUniqueId(listAnimatedElements[groupEnemy[groupId][jjj]][iii]->GetUniqueId(), iii);
+						result = createUniqueId(listAnimatedElements[gId][iii]->GetUniqueId(), iii);
 					}
 				}
 			}