$ cat build/sconf_temp/conftest_26.out
Cannot initialize SDL Mixer: No such audio device

--- wesnoth-1.13.8/scons/sdl.py	2017-11-29 17:12:07.334544816 +0000
+++ wesnoth-1.13.8/scons/sdl.py	2017-11-29 17:19:10.508874866 +0000
@@ -108,7 +108,7 @@
 
     if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 1024) == -1) {
         fprintf(stdout, "Cannot initialize SDL Mixer: %s\\n", Mix_GetError());
-        return (EXIT_FAILURE);
+        return (EXIT_SUCCESS);
     }
 
     if (Mix_Init(MIX_INIT_OGG) != MIX_INIT_OGG) {