diff --git a/Makefile b/Makefile
index f7b5c44..cf1c53f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,13 @@
 .SILENT: help
+
+#
+# all configuration is set in the Makefile.config file.
+#
+
 VERSION = 0.0.1
 APP = simpleskycam
 
+include Makefile.config
 -include Makefile.rules
 
 OBJECTS := $(OBJECTS) gui.oo main.oo error.oo \
@@ -44,7 +50,12 @@ config: Makefile.rules
 	echo "#define _CONFIG_H_" >> config.h
 	echo "" >> config.h
 	echo "#define VERSION \"$(VERSION)\"" >> config.h
-	echo "#define USE_SVBONY" >> config.h
+ifeq ($(USE_SVBONY),1)
+	echo "#define USE_SVBONY" >> config.h 
+endif
+ifeq ($(DEBUG_ANGLES),1)
+	echo "#define DEBUG_ANGLES" >> config.h 
+endif
 	echo "" >> config.h
 	echo "#endif" >> config.h
 
@@ -84,7 +95,7 @@ dist: clean
 	rm -rf $(DISTNAME)
 
 dep:
-	$(CXX) -MM `ls *.cc` $(CXXFLAGS) > $(DEPENDFILE)
+	$(CXX) -M `ls *.cc` $(CPPFLAGS) > $(DEPENDFILE)
 
 .PHONY: all
 .PHONY: count
diff --git a/Makefile.config b/Makefile.config
new file mode 100644
index 0000000..2653a43
--- /dev/null
+++ b/Makefile.config
@@ -0,0 +1,8 @@
+
+#
+# configurations should be made in here.
+# set one of these variables to 0 to disable the function.
+#
+USE_SVBONY = 1
+DEBUG_ANGLES = 1
+
diff --git a/Makefile.rules.linux b/Makefile.rules.linux
index 4867d20..fb7e3d2 100644
--- a/Makefile.rules.linux
+++ b/Makefile.rules.linux
@@ -1,4 +1,6 @@
 
+include Makefile.config
+
 TARGET = $(APP)
 
 CPP = c++
@@ -10,11 +12,24 @@ OBJECTS =
 
 
 #
-# Uncomment to enable support for SVBONY Cammeras.
+# add makefile configuration for svbony cams 
 #
+ifeq ($(USE_SVBONY),1)
 CPPFLAGS := $(CPPFLAGS) -I/usr/local/include
 LDFLAGS := $(LDFLAGS) -lSVBCameraSDK -L/usr/local/lib
 OBJECTS := $(OBJECTS) videodev-svbcam.oo
-# 
+endif
+#
+
+
+#
+# add configuration for debug_angles
+#
+ifeq ($(DEBUG_ANGLES),1)
+CPPFLAGS := $(CPPFLAGS)
+OBJECTS := $(OBJECTS) debug-angles.oo
+endif
+#
+
 
  
diff --git a/debug-angles.cc b/debug-angles.cc
new file mode 100644
index 0000000..dec351b
--- /dev/null
+++ b/debug-angles.cc
@@ -0,0 +1,26 @@
+/***************************************************************************************
+ *
+ * debug-angles.cc is part of SimpleSkyCam.
+ *
+ *****************************************************************************************/
+
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+#include <glib.h>
+
+#include "debug.h"
+
+void debug_angles_draw(cairo_t *cr) {
+
+};
+
+
+void debug_angles_motionevent(GdkEvent *event) {
+
+};
+
+
+void debug_angles_btnpress(GdkEvent *event) {
+
+};
+
diff --git a/debug.h b/debug.h
new file mode 100644
index 0000000..5d16ece
--- /dev/null
+++ b/debug.h
@@ -0,0 +1,20 @@
+/***************************************************************************************
+ *
+ * debug.h is part of SimpleSkyCam.
+ *
+ *****************************************************************************************/
+
+#ifndef _DEBUG_H_
+#define _DEBUG_H_
+
+#include "config.h"
+#include "simpleskycam.h"
+#include "gui.h"
+
+#ifdef DEBUG_ANGLES
+extern void debug_angles_draw(cairo_t *cr);
+extern void debug_angles_motionevent(GdkEvent *event);
+extern void debug_angles_btnpress(GdkEvent *event);
+#endif
+
+#endif
diff --git a/simpleskycam.h b/simpleskycam.h
index 4de9cd9..38e3db0 100644
--- a/simpleskycam.h
+++ b/simpleskycam.h
@@ -2,7 +2,9 @@
 #ifndef _SIMPLESKYCAM_H_
 #define _SIMPLESKYCAM_H_
 
+#include "config.h"
 #include "gui.h"
+#include "debug.h"
 
 extern void errorexit(char *fmt, ...);
 extern void calc_vec2anglelen(position_f_2d *p, vector_2d *v);
@@ -10,5 +12,6 @@ extern void calc_vec2anglelen(position_f_2d *p, vector_2d *v);
 #define sindeg(_angle_) sin((M_PI * _angle_ / 180.0))
 #define cosdeg(_angle_) cos((M_PI * _angle_ / 180.0))
 
+
 #endif
 
diff --git a/video.cc b/video.cc
index f559163..f6b5f71 100644
--- a/video.cc
+++ b/video.cc
@@ -16,6 +16,7 @@
 #include "video.h"
 #include "videodev.h"
 #include "histogram.h"
+#include "simpleskycam.h"
 
 VideoDev *videodev = NULL;
 GThread *videodev_thread = NULL;
@@ -234,6 +235,11 @@ void cb_videoda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer data)
     snprintf (txt2, 255, "Y: %f", detectedpos_data.dy);
     gtk_label_set_text(GTK_LABEL(lbX), txt1);
     gtk_label_set_text(GTK_LABEL(lbY), txt2);
+
+#ifdef DEBUG_ANGLES
+    debug_angles_draw(cr);
+#endif
+
     /*   drawing the text on the screen disabled
     for (int i = 0; i < 5; i++) {
     	int dx, dy;
@@ -630,6 +636,10 @@ void cb_videoda_motionevent (GtkWidget *widget, GdkEvent *event, gpointer data)
 
 	    gdk_window_invalidate_rect(gtk_widget_get_window(video_da), NULL, true);
 	}
+
+#ifdef DEBUG_ANGLES
+	debug_angles_motionevent(event);
+#endif
 };
 
 
@@ -637,6 +647,10 @@ void cb_videoda_btnpress (GtkWidget *widget, GdkEvent *event, gpointer data) {
 	int x = event->motion.x;
 	int y = event->motion.y;
 
+#ifdef DEBUG_ANGLES
+	debug_angles_btnpress(event);
+#endif
+
 	printf ("%s:%d %s %d, %d\n", __FILE__, __LINE__, __FUNCTION__, x, y);
 };
 
diff --git a/videodev.cc b/videodev.cc
index d8b5d62..105ff21 100644
--- a/videodev.cc
+++ b/videodev.cc
@@ -23,6 +23,7 @@
 #include <string>
 #include <setjmp.h>
 
+#include "simpleskycam.h"
 #include "gui.h"
 #include "video.h"
 #include "videoframe.h"
diff --git a/videodev.h b/videodev.h
index 7d69b10..2987cbc 100644
--- a/videodev.h
+++ b/videodev.h
@@ -10,6 +10,7 @@
 #include <string>
 #include <list>
 
+#include "simpleskycam.h"
 #include "json.h"
 #include "gui.h"
 #include "config.h"