Packaging Increase Timeout for poor internet speed.

[Mohammad BadieZadegan]

Hi every body,
I installed the latest version of DragonflyBSD but I can not download
ftp://ftp.dragonflybsd.org/dports/dragonfly%3A4.8%3Ax86%3A64/LATEST/All/llvm39-3.9.1_3.txz
by pkg install command for installing any X because of my poor intenet
connection.
BTW, I could download it by axel but it did not resolve my issue while I
copied it manually into /var/cache/pkg.
How can I increase PKG timeout or anyways to solve my issue?
Thanks.