[R] Udpate R under a proxy

[justin bem]

dear all,

I get internet via a proxy server when I try to
downlaod package it always fail. Even when i add and
environnment variable for the http proxy server. I use
windows XP SP2

Sincerly

Justin BEM
Elève Ingénieur Statisticien Economiste
BP 294 Yaoundé.
Tél (00237)9597295.