Hello,
Just came across this pkgsrc package and discovered that the original
developer has pulled the source and put up the following message:

(ref http://www.xs4all.nl/~jantien/yodl/ )
--
Yodl has been discontinued

If you were looking for yodl, you're out of luck. Yodl has been
discontinued, you are advised to use texinfo.

We have dropped yodl more than four years ago*), and it has been
unmaintained since.

*) Sep 3 1999 lilypond-1.2.6.tar.gz 

   CHANGES-1.2:
   pl 5.hwn1
           - more .texi; yodl completely removed.

--

That said, Yodl _is_ still alive and being worked on:
http://sourceforge.net/projects/yodl
 and documentation is at
http://yodl.sourceforge.net/

The current NetBSD package should probably be either updated or removed
as it can't build as-is.

Regards,
Jeff Woodall