[Nemphys]

Hmmm, that is weird...
Makes sense, cause I have XBMC running on Ubuntu, but why on earth would that happen?
Anyway, concerning the compilation, I just changed the 10000 * 1048576LL value of timeshift_max_size to 1000000000, which should roughly be 1GB.
I am sure this is not the way to go, but at least it does compile that way.

Adam, any idea why rw/ff is only available in the Windows build?

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I just checked the code and it seems the rw/ff buttons are disabled because XBMC is expecting TVHeadend to send "timeshiftseek" along with "timeshift" as a server capability in order to enable them, but the current version of TVHeadend does not send it (nor did any previous versions according to git log).
I tried changing the code to enable it, but of course it (almost) didn't work: the buttons were enabled, but only pressing ff IF already paused would work. All other presses of rw/ff would crash XBMC.
It makes me wonder, though, since you say it works in XBMC under Windows.
It definitely shouldn't, since the server side decides if the buttons should be enabled or not (let alone the fact that it seems the feature has not been implemented yet).
Adam, any insight would be appreciated...

EDIT: just realized that opdenkamp added this check to XBMC pvr-addons 12 days ago, so you might be running an older version under windows, hence the difference.
Are you sure it works properly, though?