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The HAVE_SIGNAL_H dependent signal.h includes in playmus.c and playwave.c are misplaced, because SDL_config.h is not included at that point and this causes signal.h to be never included. Moving it after the SDL.h and SDL_mixer.h includes fixes the issue, like in the following.  Regards.

--- playmus.c~
+++ playmus.c
@@ -26,9 +26,6 @@
 #include <stdio.h>
 #include <string.h>
 
-#ifdef HAVE_SIGNAL_H
-#include <signal.h>
-#endif
 #ifdef unix
 #include <unistd.h>
 #endif
@@ -36,6 +33,10 @@
 #include "SDL.h"
 #include "SDL_mixer.h"
 
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
 
 static int audio_open = 0;
 static Mix_Music *music = NULL;
--- playwave.c~
+++ playwave.c
@@ -26,9 +26,6 @@
 #include <stdio.h>
 #include <string.h>
 
-#ifdef HAVE_SIGNAL_H
-#include <signal.h>
-#endif
 #ifdef unix
 #include <unistd.h>
 #endif
@@ -36,6 +33,10 @@
 #include "SDL.h"
 #include "SDL_mixer.h"
 
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
 
 /*
  * rcg06132001 various mixer tests. Define the ones you want.