diff --git a/simpledisplay.d b/simpledisplay.d
index dbe7f2d..1fda777 100644
--- a/simpledisplay.d
+++ b/simpledisplay.d
@@ -5775,8 +5775,11 @@ extern(System){
 	void glTexCoord2f(float, float);
 	void glVertex2i(int, int);
 	void glBlendFunc (int, int);
+	void glDepthFunc (int);
 	void glViewport(int, int, int, int);
 
+	void glClearDepth(double);
+
 	void glReadBuffer(uint);
 	void glReadPixels(int, int, int, int, int, int, void*);
 
@@ -5786,6 +5789,7 @@ extern(System){
 	enum uint GL_BLEND = 0x0be2;
 	enum uint GL_SRC_ALPHA = 0x0302;
 	enum uint GL_ONE_MINUS_SRC_ALPHA = 0x0303;
+	enum uint GL_LEQUAL = 0x0203;
 
 
 	enum uint GL_UNSIGNED_BYTE = 0x1401;