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bbfa235
(Get the code!)
I must admit, I could not care less for a strange kernel from a unknown PPA :)
But it seems I am a too nice person (hahaha) and I had a look at these kernel packages provided there.
There is no DECLARE_MUTEX defined in them, just DEFINE_SEMAPHORE.
Looking further this is also the case for linux-rt-2.6.31 from Lucid. However linux-2.6.32 from Lucid and linux-2.6.35 from Maverick support DECLARE_MUTEX only!
DECLARE_MUTEX is removed in the rt-patch and this seems to be the reason here. I see no way to autodetect all possible (old) rt kernels and use D_S on them as I do since 2.6.37 on all kernels, so I fear this will go wont-fix if you have no better suggestion (do you use that old kernel anyways?)