I found a solution about the problem with pkgsrc when CC=distcc, before
I got :
===> Required package gcc3-c>=3.3.3: NOT found

But I found a trick:
install autoswc (which caches autoconf globally)
then add to /etc/mk.conf :
.sinclude "/usr/pkg/share/autoswc/autoswc.mk"

run autoswc...

then when compiling a package from pkgsrc, near everything is cached and
informations were retrieved with CC=gcc , now even with CC=distcc it
works very nicely :)

Hope it will help someone...

++ fab.