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