# define Perl_set_numeric_local perl_set_numeric_local
# define Perl_set_numeric_standard perl_set_numeric_standard
# define PERL_POLLUTE
-# ifndef EMBEDMYMALLOC
-# define PERL_POLLUTE_MALLOC
+/* malloc() pollution was the default in earlier versions, so enable
+ * it for bincompat; but not for systems that used to do prevent that,
+ * or when they ask for {HIDE,EMBED}MYMALLOC */
+# if !defined(EMBEDMYMALLOC) && !defined(HIDEMYMALLOC)
+# if !defined(NeXT) && !defined(__NeXT) && !defined(__MACHTEN__) && \
+ !defined(__QNX__)
+# define PERL_POLLUTE_MALLOC
+# endif
# endif
#endif