diff --git a/examples/tetris/tetris.v b/examples/tetris/tetris.v
index 8f3ba73f79..1b1366953d 100644
--- a/examples/tetris/tetris.v
+++ b/examples/tetris/tetris.v
@@ -141,7 +141,7 @@ fn main() {
 			use_ortho: true // This is needed for 2D drawing
 			create_window: true
 			window_title: 'V Tetris'
-			window_user_ptr: game
+			//window_user_ptr: game
 		})
 		ft: freetype.new_context(gg.Cfg{
 			width: WinWidth
diff --git a/vlib/gl/gl.v b/vlib/gl/gl.v
index 22da632379..0dd3267e19 100644
--- a/vlib/gl/gl.v
+++ b/vlib/gl/gl.v
@@ -39,9 +39,9 @@ fn C.glAttachShader()
 fn C.glGetShaderiv()
 fn C.glCompileShader()
 fn C.glShaderSource()
-fn C.glCreateProgram()
+fn C.glCreateProgram() int
 fn C.glClear()
-fn C.glCreateShader()
+fn C.glCreateShader() int
 fn C.glClearColor()
 fn C.glViewport()
 fn C.gladLoadGL()
diff --git a/vlib/glfw/glfw.v b/vlib/glfw/glfw.v
index 7def0c39b3..a4165a15f0 100644
--- a/vlib/glfw/glfw.v
+++ b/vlib/glfw/glfw.v
@@ -69,7 +69,7 @@ fn C.glfwSetWindowSizeCallback()
 fn C.glfwSetMouseButtonCallback()
 fn C.glfwSetCursorPosCallback()
 fn C.glfwSwapBuffers()
-fn C.glfwWindowShouldClose()
+fn C.glfwWindowShouldClose() bool
 fn C.glfwSetWindowShouldClose()
 fn C.glfwWaitEvents()
 fn C.glfwPollEvents()