diff -Naur old/configure new/configure
--- old/configure	2012-04-11 09:33:55.000000000 +0200
+++ new/configure	2012-04-11 12:05:07.098916602 +0200
@@ -96,9 +96,9 @@
   fi
 }
 
-CFLAGS=""
-CPPFLAGS=""
-LDFLAGS=""
+CFLAGS="$CFLAGS"
+CPPFLAGS="$CXXFLAGS"
+LDFLAGS="$LDFLAGS"
 OPTIM=""
 
 do_echo -n "Determining compiler version to use... "
@@ -451,6 +451,8 @@
   OPTIM="$OPTIM_BACKUP $BEST_CPUFEATURE"
 fi
 
+OPTIM=""
+
 do_echo "Updating Makefile.sets ..."
 
 if [ "$DEBUG" = "1" ]; then