diff --git a/stepmania/configure.ac b/stepmania/configure.ac
index e676e56a44..de6f79a723 100644
--- a/stepmania/configure.ac
+++ b/stepmania/configure.ac
@@ -63,6 +63,17 @@ AH_VERBATIM([VA_ZZZ_NEEDED_FUNCS],
 #endif
 ])
 
+AC_CHECK_DECLS([SIGPWR, SIGUSR1],,,[#include <signal.h>])
+AH_VERBATIM([SIGNALS],
+[#if !HAVE_DECL_SIGPWR
+#if HAVE_DECL_SIGUSR1
+#define SIGPWR SIGUSR1
+#else  //!HAVE_DECL_SIGUSR1
+#define SIGPWR 30
+#endif //HAVE_DECL_SIGUSR1
+#endif //!HAVE_DECL_SIGPWR
+])
+
 case $host in
 	*-*-darwin*)
 		AC_DEFINE(DARWIN, 1, [Use different sound drivers than linux])
@@ -70,6 +81,7 @@ case $host in
 esac
 AM_CONDITIONAL(DARWIN, test x$darwin = xtrue)
 
+
 # sdl-config puts -L/usr/lib in the library search path, which reorders things
 # in a way that breaks some configurations.
 SDL_LIBS="`echo $SDL_LIBS | sed 's_-L/usr/lib/\?[[ $]]__'`"