cmake dependency issue?

[Benjamin Reed]

So it turns out that the DNSSD test was failing on OSX because there's
no -ldns_sd (which there shouldn't be, the DNS-SD stuff is direct in
libSystem/libc on OSX).  Attached is a patch, not sure if there's a
better way to do this.

Now, though, I get an error trying to compile the dnssd portion of
kdelibs4_snapshot on OSX:

make[2]: *** No rule to make target `bin/kconfig_compiler', needed by
`dnssd/settings.h'.  Stop.


It looks like it's wanting bin/kconfig_compiler instead of
bin/kconfig_compiler.app (or kconfig_compiler.sh).

Where is this dependency coming from?