[Ubuntu] problem building GRASS add-ons

[Taylor Hermes]

I'm running Ubuntu 10.04 and GRASS 6.4.0 rc6.  I would like to install
the GRASS add-ons available from the SVN, but when I attempt to 'make
MODULE_TOPDIR=/usr/lib/grass64' I get an error.

mkdir -p /build/buildd/grass-6.4.0~rc6/bin.x86_64-pc-linux-gnu
mkdir: невозможно создать каталог «/build»: Отказано в доступе
make: *** [/build/buildd/grass-6.4.0~rc6/bin.x86_64-pc-linux-gnu] Ошибка

I have the grass-dev package installed and followed the directions
available here:http://grass.osgeo.org/wiki/Compile_and_Install#Addons

Thank you for your help!