Bind build

I am using an old Dell at home. It's a Dimension 4700. I built Bind-9.7.1 package. The result is a little bit unusual because the -j1 is a bit faster than other settings.

-j1
real    2m16.900s
user    1m21.478s
sys     0m29.533s
-j2
real    2m17.327s
user    1m22.982s
sys     0m29.513s
-j3
real    2m17.568s
user    1m23.123s
sys     0m29.414s
-j4
real    2m17.716s
user    1m23.237s
sys     0m29.498s
-j5
real    2m17.602s
user    1m23.132s
sys     0m29.581s