pkg periodic with proxy

[Andrea Venturoli]

Hello.

/usr/local/etc/periodic/security/410.pkg-audit is failing with:
 >pkg: http://www.vuxml.org/freebsd/vuln.xml.bz2: Permission denied
 >pkg: cannot fetch vulnxml file

The reason is that this machine needs to go through a proxy; in fact it 
works if I launch it manually (where I have HTTP_PROXY set).

How to deal with this without modifying the script itself?

  bye & Thanks
	av.