building ruby21-base on netbsd 6.0.2

[matthew sporleder <msporleder%gmail.com@localhost>]

I end up in a bad situation building ruby21-base on netbsd 6.0.2

the
checking for broken backtrace...

just hangs during configure.
Here's a ktrace of what happens:
https://gist.github.com/msporleder/ab2a4e5f1bd0db3f1034

I've also tried prefer pkgsrc for libexecinfo.

Any other hints?

Thanks,
Matt