--- ./telnet/commands.c	2015-03-31 15:40:50.000000000 +0000
+++ ../commands.c	2018-03-21 15:24:39.867877463 +0000
@@ -1584,7 +1584,7 @@
 	 */
 	register char *shellp, *shellname;
 # ifndef strrchr
-	extern char *strrchr (const char *, int);
+	extern char __attribute__((overloadable)) *strrchr (const char *, int);
 # endif
 
 	shellp = getenv ("SHELL");
@@ -1881,7 +1881,7 @@
   register char **epp, *cp;
   register struct env_lst *ep;
 #ifndef strchr
-  extern char *strchr (const char *, int);
+  extern char __attribute__((overloadable)) *strchr (const char *, int);
 #endif
 
   for (epp = environ; *epp; epp++)