[Dev-luatex] keeping in sync with pdftex changes

[Ulrike Fischer]

Am Tue, 12 Jan 2021 12:59:55 +0100 schrieb Hans Hagen:

> It will be:
> 
> \protected\def\pdfrunninglinkoff{\pdfextension linkstate 1 }
> \protected\def\pdfrunninglinkon {\pdfextension linkstate 0 }

Sounds good. How can one test if the extension is there? Do one has
to test against the luatex version or is there something like a
\ifdefinedextension test?


-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/