diff -ruN stk-4.2.0-old/configure.ac stk-4.2.0/configure.ac
--- stk-4.2.0-old/configure.ac	2004-09-24 19:51:45.000000000 +0200
+++ stk-4.2.0/configure.ac	2005-09-14 16:55:53.000000000 +0200
@@ -49,7 +49,7 @@
 AC_ARG_ENABLE(debug,
   [  --enable-debug = enable various debug output],
   [AC_SUBST( debug, ["-D_STK_DEBUG_ -D__RTAUDIO_DEBUG__"] ) AC_SUBST( cflags, ["-g -O2"] ) AC_SUBST( object_path, [Debug] ) AC_MSG_RESULT(yes)],
-  [AC_SUBST( debug, [] ) AC_SUBST( cflags, [-O3] ) AC_SUBST( object_path, [Release] ) AC_MSG_RESULT(no)])
+  [AC_SUBST( debug, [] ) AC_SUBST( cflags, [-O2] ) AC_SUBST( object_path, [Release] ) AC_MSG_RESULT(no)])
 
 # Check compiler and use -Wall if gnu.
 if test $GXX = "yes" ; then