$NetBSD: patch-ah,v 1.1 2007/10/10 17:12:52 rillig Exp $

--- lib/contact.c.orig	2007-10-10 17:04:00.000000000 +0000
+++ lib/contact.c	2007-10-10 17:05:37.000000000 +0000
@@ -704,7 +704,7 @@ typedef enum _VcardState
 
 #define myisblank(c)    ((c) == ' '  || (c) == '\t')
 #define myisnewline(c)  ((c) == '\n' || (c) == '\r')
-
+#define myisxdigit(c)   isdigit((unsigned char)(c))
 #define STR_EQUAL(a,b)  (0 == strcasecmp(a,b))
 
 #define STR_IN_STR(haystack, needle)  (0 != strcasestr(haystack, needle))
@@ -755,7 +755,7 @@ static char* strdup_quoted_printable(con
 	{
 		if ('=' == source[0])
 		{
-			if (isxdigit(source[1]) && isxdigit(source[2]))
+			if (myisxdigit(source[1]) && myisxdigit(source[2]))
 			{
 				char hex[3] = {source[1], source[2], '\0'};
 				*dest++ = strtol(hex, NULL, 16);