The build directory should be a symbolic link to the relevant kernel source tree. If it doesn't exist, you can create it with ln, e.g.
ln -s /usr/src/linux-2.6.30.5 /lib/modules/2.6.30.5/build,
assuming the source is in /usr/src/linux-2.6.30.5 of course. If you don't have modules for your 2.6.30.5 kernel, then I'm not sure, because perhaps /lib/modules/2.6.30.5 won't exist. In that case, you could try creating it and see if that works.
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