diff --git a/Code/Makefile.vbcc b/Code/Makefile.vbcc
new file mode 100644
index 0000000..518e284
--- /dev/null
+++ b/Code/Makefile.vbcc
@@ -0,0 +1,90 @@
+# Makefile for Sevgi_Engine projects (vbcc, first path)
+
+EXE = sevgi_engine
+
+################################################################################
+VBCC = /opt/amiga/vbcc
+NDK  = /opt/amiga/ndk32
+AS = /opt/amiga/vbcc/bin/vasmm68k_mot
+
+CC = $(VBCC)/bin/vc +aos68k
+OPTIONS = -DNO_INLINE_STDARG
+LFLAGS = -L$(VBCC)/targets/m68k-amigaos/lib -lauto -lamiga
+################################################################################
+
+# Common options
+WARNINGS =
+OPTIMIZE =
+DEBUG =
+IDIRS = -I$(NDK)/Include_H -I./SDI_headers
+
+CFLAGS = -c $(WARNINGS) $(OPTIMIZE) $(DEBUG) $(OPTIONS) $(IDIRS)
+CFLAGS_NOOPT = -c $(WARNINGS) $(DEBUG) $(OPTIONS) $(IDIRS)
+AFLAGS = -Faout -m68020
+
+DEPS = assets.h palettes.h settings.h version.h
+
+OBJS = main.o system.o keyboard.o input.o display.o diskio.o fonts.o         \
+       color.o rainbow.o tiles.o tilemap.o audio.o ptplayer.o ui.o           \
+       gameobject.o physics.o level.o anims.o collisions.o                   \
+       display_level.o display_loading.o display_menu.o display_splash.o
+################################################################################
+
+all : $(EXE)
+
+main.o : main.c version.h
+	$(CC) $(CFLAGS) $<
+
+audio.o : audio.c audio.h settings.h
+	$(CC) $(CFLAGS) $<
+
+color.o : color.c color.h settings.h
+	$(CC) $(CFLAGS) $<
+
+diskio.o : diskio.c diskio.h settings.h
+	$(CC) $(CFLAGS) $<
+
+display_level.o : display_level.c level_display_loop.c level_display_gradients.c level_display_gradients.h display_level.h anims.h collisions.h settings.h
+	$(CC) $(CFLAGS) $<
+
+display_loading.o : display_loading.c display_loading.h settings.h
+	$(CC) $(CFLAGS) $<
+
+display_menu.o : display_menu.c display_menu.h settings.h
+	$(CC) $(CFLAGS) $<
+
+display_splash.o : display_splash.c display_splash.h version.h settings.h
+	$(CC) $(CFLAGS) $<
+
+fonts.o : fonts.c fonts.h assets.h settings.h
+	$(CC) $(CFLAGS) $<
+
+gameobject.o : gameobject.c gameobject.h anims.h collisions.h settings.h
+	$(CC) $(CFLAGS) $<
+
+input.o : input.c input.h
+	$(CC) $(CFLAGS_NOOPT) $<
+
+level.o : level.c level.h assets.h settings.h palettes.h
+	$(CC) $(CFLAGS) $<
+
+ptplayer.o : ptplayer.asm
+	$(AS) $(AFLAGS) -o $@ $<
+
+rainbow.o : rainbow.c rainbow.h settings.h
+	$(CC) $(CFLAGS) $<
+
+tiles.o : tiles.c tiles.h settings.h
+	$(CC) $(CFLAGS) $<
+
+ui.o : ui.c ui.h
+	$(CC) $(CFLAGS) $<
+
+$(EXE) : $(OBJS)
+	$(CC) -o $(EXE) $(OBJS) $(LFLAGS)
+
+clean:
+	rm -f $(EXE)
+	rm -f $(OBJS)
+	rm -f ./fonts/fontcache
+	find . -name '*.uaem' -delete
diff --git a/Code/display_menu.c b/Code/display_menu.c
index 3dcc24b..f49a76d 100644
--- a/Code/display_menu.c
+++ b/Code/display_menu.c
@@ -388,7 +388,7 @@ STATIC ULONG menuDisplayLoop()
   BOOL exiting = FALSE;
   ULONG return_value = 0;
   ULONG input_delay = 0;
-  clicked_button = NULL;
+  clicked_button = 0;
 
   color_table->state = CT_FADE_IN;
 
diff --git a/Code/keyboard.c b/Code/keyboard.c
index 75adbf0..1057248 100644
--- a/Code/keyboard.c
+++ b/Code/keyboard.c
@@ -29,10 +29,10 @@ BOOL setKeyboardAccess(VOID)
 {
   struct IOStdReq* ioStdReq = NULL;
 
-  if ((keyMP = CreatePort(NULL, NULL))) {
+  if ((keyMP = CreatePort(NULL, 0L))) {
     if ((ioStdReq = (struct IOStdReq*)CreateExtIO(keyMP, sizeof(struct IOStdReq)))) {
       keyIO = (struct IORequest*)ioStdReq;
-      if (!OpenDevice("keyboard.device", NULL, keyIO, NULL)) {
+      if (!OpenDevice("keyboard.device", 0L, keyIO, 0L)) {
         device_ok = TRUE;
         ioStdReq->io_Command = KBD_READMATRIX;
         ioStdReq->io_Data    = (APTR)keyMatrix;
diff --git a/Code/ui.c b/Code/ui.c
index 4b83375..a17781e 100644
--- a/Code/ui.c
+++ b/Code/ui.c
@@ -38,8 +38,13 @@
 
 #define IS_IN_RECT(x, y, x1, y1, x2, y2) ((x) >= (x1) && (x) < (x2) && (y) >= (y1) && (y) < (y2))
 
-#define	LONG_MAX   0x7FFFFFFFL
-#define	LONG_MIN (-0x7FFFFFFFL - 1)
+#ifndef LONG_MAX
+#define LONG_MAX   0x7FFFFFFFL
+#endif
+
+#ifndef LONG_MIN
+#define LONG_MIN (-0x7FFFFFFFL - 1)
+#endif
 ///
 ///prototypes
 VOID setParents(struct UIO_Group* root);
@@ -60,7 +65,7 @@ extern volatile ULONG g_frame_counter;
 
 struct UIObject* ui_active_object = NULL; // the object in focus
 
-STATIC ULONG ui_screen_start = NULL;
+STATIC ULONG ui_screen_start = 0;
 STATIC struct RastPort* ui_rastport = NULL;  // the layered RastPort to draw ui graphics
 STATIC struct UIObject* ui_current_clipper = NULL; // last object setClip() has been called with
 STATIC struct UIObject* ui_hovered_object = NULL; // the object under the mouse pointer
@@ -72,8 +77,8 @@ STATIC struct MinList ui_anim_list;
 STATIC UWORD ui_disabled_pattern1[] = {0xAAAA, 0x5555};
 STATIC UWORD ui_disabled_pattern2[] = {0x5555, 0xAAAA};
 #ifdef UI_USE_STRING_GADGETS
-STATIC UBYTE ui_password_string[] = {UIOV_STRING_PASSWORD_CHAR, NULL};
-STATIC UBYTE ui_dotted_string[] = {UIOV_STRING_DOTTED_CHAR, NULL};
+STATIC UBYTE ui_password_string[] = {UIOV_STRING_PASSWORD_CHAR, 0};
+STATIC UBYTE ui_dotted_string[] = {UIOV_STRING_DOTTED_CHAR, 0};
 #endif // UI_USE_STRING_GADGETS
 ///
 
@@ -4132,7 +4137,7 @@ VOID actionString(struct UIObject* self, WORD pointer_x, WORD pointer_y, BOOL pr
         case ASCII_DEL_ALL:
         if (string->cursor_pos < string->content_length) {
           STRPTR cursor_addr = string->content + string->cursor_pos;
-          *cursor_addr = NULL;
+          *cursor_addr = 0;
           string->content_length = string->cursor_pos;
         }
         break;