diff -p -up Macaulay2-1.3.1-r9872/configure.ac.orig Macaulay2-1.3.1-r9872/configure.ac
--- Macaulay2-1.3.1-r9872/configure.ac.orig	2009-11-30 19:34:30.403224885 -0200
+++ Macaulay2-1.3.1-r9872/configure.ac	2009-11-30 19:34:39.730225055 -0200
@@ -825,7 +825,7 @@ fi
 
 if test $BUILD_cddlib = no
 then AC_LANG(C)
-     AC_CHECK_HEADER(cdd.h,,BUILD_cddlib=yes,[#include <setoper.h>])
+     AC_CHECK_HEADER(cdd/cdd.h,,BUILD_cddlib=yes,[#include <cdd/setoper.h>])
 fi
 
 AC_SUBST(ULIMIT_T,yes)