Missing files for debugging

[squaregoldfish]

I'm trying to do some debugging, and I appear to be missing some fundamental files:

Cannot find file '../sysdeps/unix/syscall-template.S'

The usual apt-file search has turned up a blank, and my Google-fu has failed me. Can anyone help?

[steeldriver]

I *think* it's an assembly template file used during the compilation of glibc - it's probably part of the glibc source package?

http://stackoverflow.com/questions/3...-a-system-call

[squaregoldfish]

Sounds promising. However, there doesn't appear to be a libc sources package in Precise. Or maybe I'm missing the correct repositories from my apt setup - Synaptic has a '-' instead of a tick for the source packages and I can't change it.