diff --git a/Makefile b/Makefile
index 6c3de0b..3c9badf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,35 +1,37 @@
 # fxengine makefile
 # fxengine needs gint  (@Lephenixnoir)
 
-target ?= sh3eb-elf
-
 cflags := -m3 -mb -D FX9860G -ffreestanding -nostdlib -fstrict-volatile-bitfields -Wall \
-          -Wextra -Os -Iinclude -I  .
+          -Wextra -Os -Iinclude -I .
+
+dflags = -MT $@ -MMD -MP -MF $(@:%.o=%.d)
 
 lib    := libfxengine.a
 header := include/
 
-prefix := $(shell $(target)-gcc -print-search-dirs | grep install \
+prefix := $(shell sh3eb-elf-gcc -print-search-dirs | grep install \
                   | sed 's/install: //')
 
 ifeq "$(prefix)" ""
-$(error "Can't find install directory")
+$(error "Can't find install directory... Leaving installation process")
 endif
 
-src := $(shell find src -name '*.c')
-
-obj := $(src:%=build/%.o)
+#src := $(shell find src -name '*.c')
+src = $(wildcard src/*.c)
 
+obj = $(src:%=build/%.o)
 
 all: $(lib)
 
 $(lib): $(obj)
-	$(target)-ar rcs $@ $^
+	sh3eb-elf-ar rcs $@ $^
 
 
 build/%.c.o: %.c
 	@ mkdir -p $(dir $@)
-	$(target)-gcc -c $< -o $@ $(cflags)
+	sh3eb-elf-gcc -c $< -o $@ $(cflags) $(dflags)
+
+include $(wildcard build/*/*.d)
 
 clean:
 	@ rm -rf build
@@ -47,3 +49,7 @@ install:
 	sh3eb-elf-ar -t $(lib)
 	cp $(lib) $(prefix)
 	cp -r $(header) $(prefix)/include/fxengine
+
+uninstall:
+	rm -f $(prefix)/$(lib)
+	rm -rf $(prefix)/include/fxengine
diff --git a/build/src/event/keyboard.c.o b/build/src/event/keyboard.c.o
deleted file mode 100644
index ad82dd2..0000000
Binary files a/build/src/event/keyboard.c.o and /dev/null differ
diff --git a/build/src/render/translate.c.o b/build/src/render/translate.c.o
deleted file mode 100644
index 192b981..0000000
Binary files a/build/src/render/translate.c.o and /dev/null differ
diff --git a/build/src/render/zbuffer.c.o b/build/src/render/zbuffer.c.o
deleted file mode 100644
index 94e41bf..0000000
Binary files a/build/src/render/zbuffer.c.o and /dev/null differ
diff --git a/include/render/bitmap.h b/include/render/bitmap.h
index b65d66c..1871016 100644
--- a/include/render/bitmap.h
+++ b/include/render/bitmap.h
@@ -1,14 +1,11 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-/* bitmap codé bit à bit
-   0 dans layout -> transparent
-   1 dans layout -> 1 dans color -> noir
-   					0 dans color -> blanc */
-/** bitmap rich type
-* @warning Monochrome only !
-* transparency is in the layout
-*/
+/**
+ * @brief  bitmap rich type
+ *    transparency is in the layout
+ * @warning Monochrome only !
+ */
 struct bitmap_rich
 {
     uint32_t size_px_x;
@@ -20,31 +17,38 @@ struct bitmap_rich
 };
 typedef struct bitmap_rich bitmap_rich;
 
-/** get the color of pixel from rich bitmap
-* @return the color coded in a unsigned char :
-*  if (color >> 1)
-*      switch (color%2)
-*      {
-*      case 0:
-*          // WHITE
-*          break;
-*      case 1:
-*          // BLACK
-*      }
-*  else
-*      // TRANSPARENT
-* @param the bitmap
-* @param x coordinate
-* @param y coordinate
-*/
+
+/**
+ * @brief      get the color of pixel from rich bitmap
+ *
+ * @param[in]  bmp   The bitmap
+ * @param[in]  x     The bitmap x coordinate (in pixels)
+ * @param[in]  y     The bitmap y coordinate (in pixels)
+ *
+ * @return the color coded in a unsigned char :
+ *  if (color >> 1)
+ *      switch (color%2)
+ *      {
+ *      case 0:
+ *          // WHITE
+ *          break;
+ *      case 1:
+ *          // BLACK
+ *      }
+ *  else
+ */
 inline uint8_t bitmap_get_pixel_r(const bitmap_rich * bmp, uint32_t x, uint32_t y);
 
-/** display a pixel from rich bitmap
-*      // TRANSPARENT
-* @param the bitmap
-* @param x coordinate
-* @param y coordinate
-*/
+
+/**
+ * @brief      display a specific rich bitmap pixel on the screen
+ *
+ * @param[in]  bmp    The bitmap
+ * @param[in]  bmp_x  The bitmap x coordinate (in pixels)
+ * @param[in]  bmp_y  The bitmap y coordinate (in pixels)
+ * @param[in]  x      screen : x coordinate
+ * @param[in]  y      screen : y coordinate
+ */
 void bitmap_display_pixel_r(const bitmap_rich * bmp, uint32_t bmp_x, uint32_t bmp_y, uint32_t x, uint32_t y);
 
 
diff --git a/libfxengine.a b/libfxengine.a
index 0878c63..8b277f0 100644
Binary files a/libfxengine.a and b/libfxengine.a differ