[tex4ht] should nameref.4ht be TL sources for tex4ht?

[Nasser M. Abbasi]

There is a known issue with tex4ht, where it fails due to
missing file nameref.4ht.

https://tex.stackexchange.com/questions/345689/paragraph-ended-before-tempc-was-complete-tex4ht-error

Strange thing, it is missing in TL.

I just did fresh install-tl on new cygwin system (under windows) and
found this one file is missing, but should it have been in TL
source tree? Since the above post is from 2016.

Error I got is

(/usr/local/texlive/2017/texmf-dist/tex/generic/tex4ht/html4.4ht)
(/usr/local/texlive/2017/texmf-dist/tex/generic/tex4ht/html4-math.4ht))
(/usr/local/texlive/2017/texmf-dist/tex/generic/tex4ht/hyperref.4ht
(/usr/local/texlive/2017/texmf-dist/tex/latex/hyperref/nameref.sty
(/usr/local/texlive/2017/texmf-dist/tex/generic/oberdiek/gettitlestring.sty))
! I can't find file `nameref.4ht'.
<argument> ...meref}\let \label \sv:label \input nameref.4ht

l.29 }

So I put a copy I had of nameref.4ht  in this folder (cygwin)

    /usr/local/texlive/2017/texmf-dist/tex/generic/tex4ht/

to make tex4ht happy. And now it compiled OK.

Is it possible to check that this file should be there?
I do not know how to search sources in tug database.

Thanks
--Nasser