diff --git a/LEGO1/lego/legoomni/include/registrationbook.h b/LEGO1/lego/legoomni/include/registrationbook.h
index b6e60ae0..c49d6bec 100644
--- a/LEGO1/lego/legoomni/include/registrationbook.h
+++ b/LEGO1/lego/legoomni/include/registrationbook.h
@@ -1,6 +1,7 @@
 #ifndef REGISTRATIONBOOK_H
 #define REGISTRATIONBOOK_H
 
+#include "legogamestate.h"
 #include "legoworld.h"
 
 class InfocenterState;
diff --git a/miniwin/src/internal/d3drmrenderer_opengl1.h b/miniwin/src/internal/d3drmrenderer_opengl1.h
index 42155b23..763509d8 100644
--- a/miniwin/src/internal/d3drmrenderer_opengl1.h
+++ b/miniwin/src/internal/d3drmrenderer_opengl1.h
@@ -4,7 +4,12 @@
 #include "d3drmtexture_impl.h"
 #include "ddraw_impl.h"
 
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#else
 #include <GL/gl.h>
+#endif
+
 #include <SDL3/SDL.h>
 #include <vector>