diff -rauN a/lib/assert.h b/lib/assert.h
--- a/lib/assert.h	2022-06-06 11:37:00.878875758 +0200
+++ b/lib/assert.h	2022-06-06 11:53:58.510305462 +0200
@@ -43,11 +43,12 @@
 #ifndef INCLUDED_ASSERT_H
 #define INCLUDED_ASSERT_H
 
+#ifndef PERL_POLLUTE
 #ifdef __STDC__
 #define assert(ex)	{if (!(ex))assertionfailed(__FILE__, __LINE__, #ex);}
 void assertionfailed(const char *file, int line, const char *expr);
 #else
 #define assert(ex)	{if (!(ex))assertionfailed(__FILE__, __LINE__, (char*)0);}
 #endif
-
+#endif /* PERL_POLLUTE */
 #endif /* INCLUDED_ASSERT_H */