diff --git a/Sources/libewol/Linux.mk b/Sources/libewol/Linux.mk
index eab686fc..36e2a466 100644
--- a/Sources/libewol/Linux.mk
+++ b/Sources/libewol/Linux.mk
@@ -16,7 +16,12 @@ LOCAL_LIBRARIES := etk freetype tinyxml libzip libpng parsersvg lua portaudio
 LOCAL_C_INCLUDES := 
 
 LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)
-LOCAL_EXPORT_LDLIBS := -lGL -lGLU -lX11
+LOCAL_EXPORT_LDLIBS := -lGL -lX11
+# -lGLU -lGLEW
+
+#http://en.wikibooks.org/wiki/OpenGL_Programming/Modern_OpenGL_Introduction
+# needed package on linux : libgl1-mesa-dev libglew1.5-dev
+
 
 LOCAL_CFLAGS := -Wno-write-strings \
                 -DEWOL_VERSION_TAG_NAME="\"$(LOCAL_VERSION_TAG_SHORT)-$(BUILD_DIRECTORY_MODE)\"" \
diff --git a/Sources/libewol/ewol/openGl.h b/Sources/libewol/ewol/openGl.h
index 049fa960..31581db1 100644
--- a/Sources/libewol/ewol/openGl.h
+++ b/Sources/libewol/ewol/openGl.h
@@ -30,8 +30,13 @@ extern "C" {
 #endif
 
 #if defined(__TARGET_OS__Linux)
+	// TO ENABLE THE SHADER api ...
+	#define GL_GLEXT_PROTOTYPES
 	#include <GL/gl.h>
+	/*
 	#include <GL/glu.h>
+	#include <GL/glext.h>
+	*/
 #elif defined(__TARGET_OS__Android)
 	#include <GLES/gl.h>
 #elif defined(__TARGET_OS__Windows)
diff --git a/Sources/libewol/ewol/os/gui.X11.cpp b/Sources/libewol/ewol/os/gui.X11.cpp
index 8ecf09b9..494b53be 100644
--- a/Sources/libewol/ewol/os/gui.X11.cpp
+++ b/Sources/libewol/ewol/os/gui.X11.cpp
@@ -1178,6 +1178,19 @@ int main(int argc, char *argv[])
 	etk::File myIcon = APP_Icon();
 	SetIcon(myIcon);
 	
+	GLuint shader;
+	/* creation */
+	shader = glCreateShader(GL_VERTEX_SHADER);
+	if(shader == 0) {
+		/* erreur de creation :( */
+		return -1;
+	}
+	/* utilisation ... */
+	/* suppression */
+	glDeleteShader(shader);
+	shader = 0;
+	
+	
 	// Run ...
 	X11_Run();
 	// close X11 :