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-              r1390
+              r1391
 @end deftypefn
 @c getruntime.c:78
+@c getruntime.c:82
 @deftypefn Replacement long get_run_time (void)
 …
 @end deftypefn
+@c hex.c:25
+@deftypefn Extension void hex_init (void)
+Initializes the array mapping the current character set to
+corresponding hex values.  This function must be called before any
+call to @code{hex_p} or @code{hex_value}.  If you fail to call it, a
+default ASCII-based table will normally be used on ASCII systems.
+@end deftypefn
+@c hex.c:34
+@deftypefn Extension int hex_p (int @var{c})
+Evaluates to non-zero if the given character is a valid hex character,
+or zero if it is not.  Note that the value you pass will be cast to
+@code{unsigned char} within the macro.
+@end deftypefn
+@c hex.c:42
+@deftypefn Extension int hex_value (int @var{c})
+Returns the numeric equivalent of the given character when interpreted
+as a hexidecimal digit.  The result is undefined if you pass an
+invalid hex digit.  Note that the value you pass will be cast to
+@code{unsigned char} within the macro.
+@end deftypefn
 @c index.c:5
 @deftypefn Supplemental char* index (char *@var{s}, int @var{c})
 …
 In particular, the empty string returns the same empty string,
 and a path ending in @code{/} returns the empty string after it.
+@end deftypefn
+@c make-relative-prefix.c:24
+@deftypefn Extension {const char*} make_relative_prefix (const char *@var{progname}, const char *@var{bin_prefix}, const char *@var{prefix})
+Given three strings @var{progname}, @var{bin_prefix}, @var{prefix}, return a string
+that gets to @var{prefix} starting with the directory portion of @var{progname} and
+a relative pathname of the difference between @var{bin_prefix} and @var{prefix}.
+For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta}, @var{prefix}
+is @code{/alpha/beta/gamma/omega/}, and @var{progname} is @code{/red/green/blue/gcc},
+then this function will return @code{/red/green/blue/../../omega/}.
+The return value is normally allocated via @code{malloc}.  If no relative prefix
+can be found, return @code{NULL}.
+@end deftypefn
+@c lrealpath.c:25
+@deftypefn Replacement {const char*} lrealpath (const char *@var{name})
+Given a pointer to a string containing a pathname, returns a canonical
+version of the filename.  Symlinks will be resolved, and ``.'' and ``..''
+components will be simplified.  The returned value will be allocated using
+@code{malloc}, or @code{NULL} will be returned on a memory allocation error.
+@end deftypefn
+@c make-relative-prefix.c:24
+@deftypefn Extension {const char*} make_relative_prefix (const char *@var{progname}, const char *@var{bin_prefix}, const char *@var{prefix})
+Given three paths @var{progname}, @var{bin_prefix}, @var{prefix},
+return the path that is in the same position relative to
+@var{progname}'s directory as @var{prefix} is relative to
+@var{bin_prefix}.  That is, a string starting with the directory
+portion of @var{progname}, followed by a relative pathname of the
+difference between @var{bin_prefix} and @var{prefix}.
+If @var{progname} does not contain any directory separators,
+@code{make_relative_prefix} will search @env{PATH} to find a program
+named @var{progname}.  Also, if @var{progname} is a symbolic link,
+the symbolic link will be resolved.
+For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta},
+@var{prefix} is @code{/alpha/beta/gamma/omega/}, and @var{progname} is
+@code{/red/green/blue/gcc}, then this function will return
+@code{/red/green/blue/../../omega/}.
+The return value is normally allocated via @code{malloc}.  If no
+relative prefix can be found, return @code{NULL}.
 @end deftypefn

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