[MacPorts] #54671: youtube-dl @2017.08.23_0 fails building on 10.5.8

[MacPorts]

#54671: youtube-dl @2017.08.23_0 fails building on 10.5.8
------------------------+------------------------
 Reporter:  udbraumann  |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:  BSD cp      |       Port:  youtube-dl
------------------------+------------------------
 While upgrading youtube-dl from 2017.08.18_0 to 2017.08.23_0 building has
 stopped here:

 {{{
 ...
 While upgrading :info:build make: Entering directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_release_ports_net_youtube-dl/youtube-dl/work/youtube-dl'
 :info:build mkdir -p zip
 :info:build for d in youtube_dl youtube_dl/downloader youtube_dl/extractor
 youtube_dl/postprocessor ; do \
 :info:build       mkdir -p zip/$d ;\
 :info:build       cp -a $d/*.py zip/$d/ ;\
 :info:build     done
 :info:build cp: illegal option -- a
 :info:build usage: cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 target_file
 :info:build        cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 ... target_directory
 :info:build cp: illegal option -- a
 :info:build usage: cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 target_file
 :info:build        cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 ... target_directory
 :info:build cp: illegal option -- a
 :info:build usage: cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 target_file
 :info:build        cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 ... target_directory
 :info:build cp: illegal option -- a
 :info:build usage: cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 target_file
 :info:build        cp [-R [-H | -L | -P]] [-fi | -n] [-pvX] source_file
 ... target_directory
 :info:build make: *** [youtube-dl] Error 64
 ...
 }}}

 Obviously, the `-a` switch has not been implemented in the 2005 BSD
 variant of `cp` (not sure if implemented at all for BSD so far). As far as
 I can see, `-a` can be mimicked using `-dR --preserve=all`, whereas `-d`
 is a brief variant of `-P --preserve=links`. Also, `-p` is more or less
 the same as `--preserve=all`. `-R` seems to have not changed since the
 2005 BSD `cp`. So I propose to use `-pPR` instead of `-a` on systems where
 `-a` (or `--archive`) is missing, or just to replace the `-a` for all
 systems with `-pPR`.

--
Ticket URL: <https://trac.macports.org/ticket/54671>
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