> i encounter the same pb with other archives like autoconf

Maybe check your /etc/mk.conf file?

>   i encounter problems when installing perl-5.6.0 from the source tree : =

I just installed this manually (It's such a pig I can't get BOTH pkgsrc and
perl on the same machine.) with only one error in the test suite, so this
should work for anyone on i386.  In a directory you have write permission:

% gzip -dc perl-5.6.0.tar.gz | tar xf -
% cd perl-5.6.0
% cp ext/DynaLoader/hints/openbsd.pl ext/DynaLoader/hints/netbsd.pl
% sh ./Configure -des -Doptimize=-O2 -Darchname=i386-netbsd -Uusemymalloc
% make
% make test
% su
# make install
# exit

Good luck.

henry nelson