SDL2 build for macOS under brew

sc2/build/unix/config_proginfo_host

@@ -81,6 +81,12 @@ case "$HOST_SYSTEM" in
 	WINSCW|GCCE|ARMV5)
 		LIB_SDL2_DETECT="false"
 		;;
+	Darwin)
+		LIB_SDL2_DETECT="have_command sdl2-config"
+		LIB_SDL2_CFLAGS='$(sdl2-config --cflags)'
+		LIB_SDL2_LDFLAGS='$(sdl2-config --static-libs)'
+		LIB_SDL2_VERSION='$(sdl2-config --version)'
+		;;
 	*)
 		LIB_SDL2_DETECT="have_command sdl2-config"
 		LIB_SDL2_CFLAGS='$(sdl2-config --cflags)'

sc2/src/darwin/SDLMain.m

@@ -10,6 +10,9 @@
 
 #import "port.h"
 #import SDL_INCLUDE(SDL.h)
+
+#if SDL_MAJOR_VERSION == 1
+
 #import "SDLMain.h"
 #import <sys/param.h>
 		/* for PATH_MAX */
@@ -282,4 +285,4 @@ main (int argc, char **argv)
 	return 0;
 }
 
-
+#endif