libretro: only use posix_memalign when it's safe

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 13a4af3..b8dc36d 100644 (file)
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -989,7 +989,11 @@ void retro_init(void)
                exit(1);
        }
 
+#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L)
        posix_memalign(&vout_buf, 16, VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
+#else
+       vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
+#endif
 
        if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir)
        {