Should make unittest work with --enable-checking?

[Johannes Pfau]

Is make unittest known to be broken when used with a compiler
configured with --enable-checking or should I file bug reports?

One failure seems related to #307, but there are some unrelated ones.
Here's the output (using GCC 4.6.2):
http://pastebin.com/PtNtTHG9

More important to me right now though:
It seems Makefile.am is missing the testgc target?