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GNAT is somewhat painful to bootstrap on new platforms
and existing binaries for OpenBSD/amd64 are for older
releases, so I made fresh ones for OpenBSD 5.0 release
on amd64 (x86_64 for Linux people) platform.
Tasking and most other "common" features should be supported,
although I suspect that GNAT-AUX 4.6.x from http://www.dragonlace.net/ passes more ACATS tests. But once you have 4.3.4 installed, you can
use it to bootstrap GNAT-AUX 4.6.x.