diff -up asc-2.8.0.1/source/libs/sdlmm/src/sdlmm_basesurface.h~ asc-2.8.0.1/source/libs/sdlmm/src/sdlmm_basesurface.h

--- asc-2.8.0.1/source/libs/sdlmm/src/sdlmm_basesurface.h~	2018-02-27 01:20:08.000000000 +0100

+++ asc-2.8.0.1/source/libs/sdlmm/src/sdlmm_basesurface.h	2021-07-29 22:00:31.785819930 +0200

@@ -139,7 +139,7 @@ namespace SDLmm {

     const void *pixels() const { return GetSurface()->pixels; }

     //! Returns the hardware-specific surface info.

-    struct private_hwdata *hwdata() const { return GetSurface()->hwdata; }

+    struct private_hwdata *hwdata() const { return (struct private_hwdata *)(GetSurface()->hwdata); }

     //@}

     //! Set the pixel to the color