make website fails first time on multithreaded build

[Francisco Vila]

Hello, I am having problems trying to build the website as if it were
the first time; subsequent tries do work and the build finishes
successfully.

However, the options CPU_COUNT=1 and -j1 work well even at first time.
The error seems to be here:

/usr/bin/python -tt
/home/fravd/source/lilypond/scripts/build/create-version-itexi.py
/home/fravd/source/lilypond > out-website/version.itexi
/usr/bin/python -tt
/home/fravd/source/lilypond/scripts/build/create-weblinks-itexi.py
/home/fravd/source/lilypond > out-website/weblinks.itexi
/bin/sh: 1: cannot create out-website/version.itexi: Directory nonexistent
/bin/sh: 1: cannot create out-website/weblinks.itexi: Directory nonexistent

Both "Directory nonexistent" errors at end dissapear when build is
tried on a single thread. So, should it be considered a bug?

Thanks.
-- 
Francisco Vila. Badajoz (Spain)
paconet.org , csmbadajoz.com