+ [AC_MSG_ERROR([SDL_image is required])])
+
+AC_SEARCH_LIBS([Sound_Init], [SDL_sound],,
+ [AC_MSG_ERROR([SDL_sound is required])])
+
+AC_SEARCH_LIBS([glBegin], [GL opengl32],,
+ [AC_MSG_ERROR([OpenGL is required])])
+
+AC_SEARCH_LIBS([gluPerspective], [GLU MesaGLU glu32],,
+ [AC_MSG_ERROR([GLU is required])])