diff --git a/dlls/opengl32/opengl_ext.h b/dlls/opengl32/opengl_ext.h
new file mode 100644
index 0000000..b09ce24
--- /dev/null
+++ b/dlls/opengl32/opengl_ext.h
@@ -0,0 +1,17 @@
+/* Typedefs for extensions loading
+
+     Copyright (c) 2000 Lionel Ulmer
+*/
+#ifndef __DLLS_OPENGL32_OPENGL_EXT_H
+#define __DLLS_OPENGL32_OPENGL_EXT_H
+
+typedef struct {
+  char  *name;     /* name of the extension */
+  void  *func;     /* pointer to the Wine function for this extension */
+  void **func_ptr; /* where to store the value of glXGetProcAddressARB */
+} OpenGL_extension;
+
+extern OpenGL_extension extension_registry[];
+extern int extension_registry_size;
+
+#endif /* __DLLS_OPENGL32_OPENGL_EXT_H */