#include <XSUB.h>
#ifndef PERL_VERSION
-# include "patchlevel.h"
+# include <patchlevel.h>
+# ifndef PERL_VERSION
+# include <could_not_find_Perl_patchlevel.h>
+# endif
# define PERL_REVISION 5
# define PERL_VERSION PATCHLEVEL
# define PERL_SUBVERSION SUBVERSION