diff -rauN Macaulay2-1.3.1-r10737.orig/configure.ac Macaulay2-1.3.1-r10737.optflags/configure.ac --- Macaulay2-1.3.1-r10737.orig/configure.ac 2010-02-17 09:23:31.000000000 +0000 +++ Macaulay2-1.3.1-r10737.optflags/configure.ac 2010-02-17 09:24:57.000000000 +0000 @@ -194,8 +194,8 @@ fi if test "$OPTIMIZE" = yes -then CFLAGS="$CFLAGS -O3" - CXXFLAGS="$CFLAGS -O3" +then CFLAGS="-O3 $CFLAGS" + CXXFLAGS="-O3 $CFLAGS" fi AC_PROG_CC() # set CFLAGS before this