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man canonicalize_file_name:

DESCRIPTION
       The call canonicalize_file_name(path) is equivalent to the call realpath(path, NULL).

CONFORMING TO
       The function is a GNU extension.

Calling realpath with a NULL target pointer is likewise a
non-standard glibc extension which is not supported by uClibc.

  -- mtr <michael@tross.org>

--- vdr-1.4.3/tools.c.orig	2006-08-12 15:30:07.000000000 +0200
+++ vdr-1.4.3/tools.c	2006-11-03 11:44:12.000000000 +0100
@@ -481,7 +481,8 @@
 {
   if (!FileName)
      return NULL;
-  char *TargetName = canonicalize_file_name(FileName);
+  char *TargetName = MALLOC(char, PATH_MAX);
+  TargetName = realpath(FileName, TargetName);
   if (!TargetName) {
      if (errno == ENOENT) // file doesn't exist
         TargetName = strdup(FileName);