Log Message:
Update to 439:

From v. 4.35 to 4.37
   Correct failure that happens when name of current directory
     contains characters with special meaning in regular expression.
   -rules option now works with -pvc
   Add -lualatex option, like -xelatex.
   File specifications in $clean_ext and $clean_full_ext are allowed
     to contain wildcards.
   Warnings are given when rc file is a directory instead of a file.
   Correct bug that if revtex4-1.cls is used, footnotes are set to
     be in the bibliography, and latexmk's aux_dir or out_dir is set,
     then latexmk fails to run bibtex when needed, because the
     relevant bib file is not found.
   Other minor corrections and code improvements.
   Documentation updates and corrections.

From v. 4.37 to 4.39
  Automatic creation of necessary subdirectories of auxdir when needed
    for writing aux files.
  Add error diagnostics to if_source
  Allow $print_type = 'auto', and make this the default, so that
    when the -p option to latexmk is used to print the file, the
    default is to determine the type of file to be printed, rather
    than always requiring postscript.
  Fix the failures when dealing with directories whose names contained
    certain special characters in them (notably '[', ']' and space).
    [Technical issue: these characters had special meaning when
    previously interpreted as metacharacters in a glob operation.]
    This gives dependency on Perl's File::Glob module, which is a
    standard module in normal installations of Perl.
  When an output directory is a subdirectory of a directory, ensure
    that it is correctly created, if it has to be created.
    Previously, the creation of the output directory when it does not
    exist only worked for one level.
    This gives dependency on Perl's File::Path module with v. >= 2.08,
    which is a standard module in normal installations of Perl.
  In output of dependencies, include pathname of target file(s) in the
    rule.
  In -pvc mode, writing of deps file (caused by the -M and related
    options) is per make not per overall run.

From v. 4.39 to 4.39 documentation update of 2 Dec 2013
  Correct two errors in documentation and in the file COPYING.