Yes, it is in the kernel source. Assuming your kernel source is in /usr/src/linux like many scripts do, the document is /usr/src/linux/Documentation/devices.txt. In this case, it's looking for a module corresponding to a device with major 10 minor 135. Translating that, I get that it is the real time clock. That means it wants RTC support in your kernel. Either it isn't compiled in at all, or it's not in as a module. The help for this particular option is extremely misleading. It makes it sound like it is totally unnecessary, but I find that a lot of programs either require or at least suggest you have it. Most stock kernels have it. Hope this helps.
