--- origsrc/lib/hash-pjw.c	2016-07-15 14:47:39.000000000 -0500
+++ src/lib/hash-pjw.c	2017-02-03 13:32:48.725613200 -0600
@@ -19,6 +19,7 @@
 
 #include "hash-pjw.h"
 
+#include <ctype.h>
 #include <limits.h>
 
 #define SIZE_BITS (sizeof (size_t) * CHAR_BIT)
@@ -38,3 +39,16 @@ hash_pjw (const void *x, size_t tablesiz
 
   return h % tablesize;
 }
+
+/* Likewise, but case-insensitive.  */
+size_t
+hash_pjw_case (const void *x, size_t tablesize)
+{
+  const unsigned char *s;
+  size_t h = 0;
+
+  for (s = x; *s; s++)
+    h = tolower (*s) + ((h << 9) | (h >> (SIZE_BITS - 9)));
+
+  return h % tablesize;
+}