--- apr-0.9.4/build/apr_common.m4~	Sat Jan 24 00:21:17 2004
+++ apr-0.9.4/build/apr_common.m4	Sat Jan 24 00:21:17 2004
@@ -228,7 +228,7 @@
           break
         fi
       done
-      if test $apr_addto_duplicate = "0"; then
+      if test $apr_addto_duplicate = "0" -a "$i" != -I/usr/include ; then
         echo "  adding \"$i\" to $1"
         $1="$$1 $i"
       fi