--- flex-2.6.4/src/config.h.in.orig	Thu Jan 23 22:25:56 2020
+++ flex-2.6.4/src/config.h.in	Thu Jan 23 22:26:30 2020
@@ -249,14 +249,8 @@
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
 
-/* Define to rpl_malloc if the replacement function should be used. */
-#undef malloc
-
 /* Define to `int' if <sys/types.h> does not define. */
 #undef pid_t
-
-/* Define to rpl_realloc if the replacement function should be used. */
-#undef realloc
 
 /* Define to `unsigned int' if <sys/types.h> does not define. */
 #undef size_t