--- ./readline/histlib.h	2017-06-04 15:51:27.000000000 +0000
+++ ../histlib.h	2018-03-21 15:09:37.286670845 +0000
@@ -52,7 +52,7 @@
 
 #ifndef member
 #  ifndef strchr
-extern char *strchr ();
+extern char __attribute__((overloadable)) *strchr ();
 #  endif
 #define member(c, s) ((c) ? ((char *)strchr ((s), (c)) != (char *)NULL) : 0)
 #endif