Linux Capabilities runtime detection

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Upgrading one of my machines to 2.6.5 and with the linux capabilities
compiled as a module (CONFIG_SECURITY_CAPABILITIES=m), I stumbled upon
the fact that a stock bind9 (9.2.3) debian sid package (hence with support for
linux capabilities) won't start anymore if the module "capability" is 
not loaded. [1]

So I was wondering if the kernel does in some way (through /proc, /sys, or some
other way) export the knowledge of having the "capability"
functionalities (as a module or statically-compiled-in) available.
I assume checking for a failed capset call is not the only way to get
this information, am I right or did I miss something obvious?

thanks,
Michele

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=245043

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