Comment 2 for bug 976551

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Jens Beyer (qcumber-some) wrote : Re: ftbfs if not including <unistd.h> in main.cc on Arch

If you search for "unistd.h gcc4.7" you'll find plenty of patches of other software which are called "fix for gcc4.7" and add a set of includes and defines which contain unisdt.h.

So your suspection is quite on-the-spot, I think :-)