[luatex] How to extend cwebmac.tex for LuaTeX?

[Andreas Scherer]

Dear all,

I would like to amend cwebmac.tex/cwebacromac.tex for use with LuaTeX. 
As is, 'cweave common; luatex common' produces 'common.pdf', but the 
links are not 'active'.

If I add something like '\ifluatex\let\ifpdftex=\ifluatex\fi' at the top 
of cwebmac.tex, 'luatex common' fails with

! Undefined control sequence.
<argument> ... \hbox to0pt{\let \*=\empty \ifpdftex \pdfdest
                                                   num \secstar 
fith\else \sp...

If I add the branch

\else\ifluatex
   \def\pdflink#1#2{\hbox{\pdfstartlink height \theheight depth \thedepth
     attr{/Border [0 0 0]} goto num #1 \Blue #1\Black\pdfendlink}}

in cwebacromac.tex (after \ifpdfttex), 'luatex common' fails with

! Undefined control sequence.
\pdflink #1#2->\hbox {\pdfstartlink
                                     height \theheight depth \thedepth 
attr{/...

Is there a special incantation of luatex to get 'active' PDF links?

Thanks for your help,
Andreas