tlpretest: two problems: optex bad linked, old linux libc.so not supported

[Petr Olsak]

Hello,

I started to experiment with tlpretest 2025 and I encountered two problems.

$ ls -la /usr/local/texlive/2025/bin/x86_64-linux/optex

lrwxrwxrwx 1 olsak olsak 6 Feb 16  2020 
/usr/local/texlive/2025/bin/x86_64-linux/optex -> luatex

should be linked: -> luahbtex, (no luatex, it will cause errors).

The second problem is due to my system is three years not upgraded:

$ luatex

luatex: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found 
(required by luatex)

ls -la /lib/x86_64-linux-gnu/libc.so.6  lrwxrwxrwx 1 root root 12 Jan 13 
16:48 /lib/x86_64-linux-gnu/libc.so.6 -> libc-2.27.so

When I try to use latest luatex (luatex_linux_x86_64_centos7) from the 
bulid farm:

https://build.contextgarden.net/#/waterfall?tags=c.luatex

then I have no problem with this old system. It means that the bulid 
parameters are set to be more benevolent to older libc.so system library 
at the build farm. Maybe, it should be to do analogical setting for 
TeXlive build.

The more libc.so versions are supported by the binary, the fewer TeXlive 
users will be in trouble.

Petr Olsak