index 263d3d8..68a8fea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,11 +45,9 @@ int f() {
 
 # Try to optimize.
 AC_MSG_CHECKING([[for optimization flags]])
-new_CFLAGS="-O3 -funroll-loops -finline-functions -fomit-frame-pointer"
+new_CFLAGS=""
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS $new_CFLAGS"
-# Remove any existing "-O2", or it will override what we're doing.
-CFLAGS=$( printf "%s" "$CFLAGS" | sed -e 's/ -O2/ /' )
 AC_LINK_IFELSE(
   [AC_LANG_PROGRAM([[
 #include <stdio.h>