diff -rua snes9x-1.51-src-orig/configure.in snes9x-1.51-src/configure.in
--- snes9x-1.51-src-orig/configure.in	2009-12-01 23:50:49.581586050 +1300
+++ snes9x-1.51-src/configure.in	2009-12-01 23:46:24.938959125 +1300
@@ -20,7 +20,7 @@
 
 SYSDEFINES=''
 
-AC_DEFUN([AC_S9X_DEFINE],
+AC_DEFUN([AC_S9X_DEFINE_DEPRECATED],
   AC_DEFINE($1, $2, $3)
   SYSDEFINES="$SYSDEFINES"' -D$1')
 
@@ -115,7 +115,8 @@
 ])
 
 if test $ac_cv_type_$1 = no; then
-  AC_S9X_DEFINE($1,$2)
+  AC_DEFINE($1, $2)
+  SYSDEFINES="$SYSDEFINES"' -D$1'
   AC_MSG_RESULT(no)
 else
   AC_MSG_RESULT(yes)
@@ -652,13 +653,14 @@
     i>>=1;
     return(i<0?0:1);
 }
-],ac_cv_my_sar_$1=yes,ac_cv_my_sar_$1=no,ac_cv_my_sar_%1=no)
+],ac_cv_my_sar_$1=yes, ac_cv_my_sar_$1=no, ac_cv_my_sar_$1=no)
 ])
 
-if test $ac_cv_my_sar_$1 = no; then
+if test x$ac_cv_my_sar_$1 = xno; then
   AC_MSG_RESULT(no)
 else
-  AC_S9X_DEFINE(RIGHTSHIFT_$1_IS_SAR)
+  AC_DEFINE(RIGHTSHIFT_$1_IS_SAR)
+  SYSDEFINES="$SYSDEFINES"' -DRIGHTSHIFT_$1_IS_SAR'
   AC_MSG_RESULT(yes)
 fi
 ])
@@ -681,11 +683,16 @@
 AC_MY_CHECK_SAR(int16)
 AC_MY_CHECK_SAR(int32)
 AC_MY_CHECK_SAR(int64)
-if test $ac_cv_my_sar_int8 = yes && \
-   test $ac_cv_my_sar_int16 = yes && \
-   test $ac_cv_my_sar_int32 = yes && \
-   test $ac_cv_my_sar_int64 = yes ; then
-  AC_S9X_DEFINE(RIGHTSHIFT_IS_SAR)
+AC_MSG_CHECKING([if rightshift is arithmetic])
+if test x$ac_cv_my_sar_int8 = xyes && \
+   test x$ac_cv_my_sar_int16 = xyes && \
+   test x$ac_cv_my_sar_int32 = xyes && \
+   test x$ac_cv_my_sar_int64 = xyes ; then
+  AC_DEFINE(RIGHTSHIFT_IS_SAR)
+  SYSDEFINES="$SYSDEFINES"' -DRIGHTSHIFT_IS_SAR'
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_RESULT(no)
 fi
 
 dnl Check accept. Thoughly.