Unable to build new lilypond on Linux Slackware 14.2

[Ivanov Dmitry]

My OS is Linux Slackware 14.2 32 bit. I am trying to install the new
version of lilypond, installed all the required packages. But I get an
error during configure:

--------------------------
WARNING: Please consider installing optional programs or files:
extractpdfmark (Using GhostScript >= 9.20 together with extractpdfmark
can significantly reduce the size of the final PDF files.) dblatex

ERROR: Please install required programs:  TeX Gyre fonts OTF (these
files are missing: texgyreschola-regular.otf texgyreschola-italic.otf
texgyreschola-bold.otf texgyreschola-bolditalic.otf
texgyreheros-regular.otf texgyreheros-italic.otf texgyreheros-bold.otf
texgyreheros-bolditalic.otf texgyrecursor-regular.otf
texgyrecursor-italic.otf texgyrecursor-bold.otf
texgyrecursor-bolditalic.otf)
--------------------------------------------

I have installed tex-gyre fonts into my TeXLive:

-------------------------------------------------------------------------
# tlmgr --verify-repo=none install tex-gyre
TeX Live 2020 is frozen and will no longer
be routinely updated. This happens in preparation for a new release.

If you're willing to help with pretesting the new release, and we hope
you are, (when pretests are available), please read
https://tug.org/texlive/pretest.html.

Otherwise, just wait, and the new release will be ready in due time.
tlmgr: package repository
ftp://tug.org/historic/systems/texlive/2020/tlnet-final (not verified:
gpg unavailable)
[1/1, ??:??/??:??] install: tex-gyre [15077k]
running mktexlsr ...
done running mktexlsr.
running updmap-sys ...
done running updmap-sys.
tlmgr: package log updated: /usr/local/texlive/2020/texmf-var/web2c/tlmgr.log
--------------------------------------------------------------------------------------

So, the package is there. But seems, that lilypond installer doesn't
see it. My TeXLive is installed into /usr/local/texlive/2020

What to do?