From RedHat mutt-1.2.5i-17, 
plus added a proto for escape().

November 2001

diff -u urlview-0.9.old/enter.c urlview-0.9/enter.c
--- urlview-0.9.old/enter.c	Tue Jul  4 12:14:30 2000
+++ urlview-0.9/enter.c	Tue Jul  4 14:48:40 2000
@@ -141,7 +141,9 @@
   int pass = (flags == M_PASS);
   int first = 1;
   int j;
+#ifndef URLVIEW
   char tempbuf[_POSIX_PATH_MAX] = "";
+#endif
 
   FOREVER
   {
diff -u urlview-0.9.old/urlview.c urlview-0.9/urlview.c
--- urlview-0.9.old/urlview.c	Tue Jul  4 12:14:30 2000
+++ urlview-0.9/urlview.c	Tue Jul  4 14:45:50 2000
@@ -46,6 +46,8 @@
 #include <rx/rxposix.h>
 #endif
 
+#define ISSPACE(c) isspace((unsigned char)c)
+
 #define DEFAULT_REGEXP "(((https?|ftp|gopher)://|(mailto|file|news):)[^' \t<>\"]+|(www|web|w3)\\.[-a-z0-9.]+)[^' \t.,;<>\"\\):]"
 #define DEFAULT_COMMAND "url_handler.sh %s"
 #define SYSTEM_INITFILE "/etc/urlview.conf"
@@ -64,6 +66,8 @@
 extern int mutt_enter_string (unsigned char *buf, size_t buflen, int y, int x,
 		int flags);
 
+extern char *quote (char *d, size_t l, const char *f);
+extern char *escape (char *d, size_t l, const char *f);
 void search_forward (char *search, int urlcount, char **url, int *redraw, int *current, int *top)
 {
   regex_t rx;
@@ -198,10 +202,10 @@
     {
       if (buf[0] == '#' || buf[0] == '\n')
 	continue;
-      if (strncmp ("REGEXP", buf, 6) == 0 && isspace (buf[6]))
+      if (strncmp ("REGEXP", buf, 6) == 0 && ISSPACE (buf[6]))
       {
 	pc = buf + 6;
-	while (isspace (*pc))
+	while (ISSPACE (*pc))
 	  pc++;
 	wc = regexp;
 	while (*pc && *pc != '\n')
@@ -235,10 +239,10 @@
 	}
 	*wc = 0;
       }
-      else if (strncmp ("COMMAND", buf, 7) == 0 && isspace (buf[7]))
+      else if (strncmp ("COMMAND", buf, 7) == 0 && ISSPACE (buf[7]))
       {
 	pc = buf + 7;
-	while (isspace (*pc))
+	while (ISSPACE (*pc))
 	  pc++;
 	pc[ strlen (pc) - 1 ] = 0; /* kill the trailing newline */
 	strncpy (command, pc, sizeof (command) - 1);