The update of www/youtube-dl to youtube_dl-2017.10.01 fails with an error:

===>  Building for youtube_dl-2017.10.01
--- youtube-dl ---
mkdir -p zip
for d in youtube_dl youtube_dl/downloader youtube_dl/extractor youtube_dl/postprocessor ; do  mkdir -p zip/$d ; cp -pPR $d/*.py zip/$d/ ; done
touch -t 200001010101 zip/youtube_dl/*.py zip/youtube_dl/*/*.py
mv zip/youtube_dl/__main__.py zip/
cd zip ; zip -q ../youtube-dl youtube_dl/*.py youtube_dl/*/*.py __main__.py
rm -rf zip
echo '#!/usr/local/bin/python2.7' > youtube-dl
cat youtube-dl.zip >> youtube-dl
cat: youtube-dl.zip: No such file or directory
*** [youtube-dl] Error code 1

make[2]: stopped in /usr/ports/www/youtube_dl/work/youtube-dl
1 error

make[2]: stopped in /usr/ports/www/youtube_dl/work/youtube-dl
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure to
the maintainer.
*** Error code 1