$> sh Configure -de -Dprefix=/Users/jeanluca/software/perl
..... 
$> make
.....
$> make install
.....
./perl installperl --destdir=  
/usr/local/bin is not writable by you
make[1]: *** [install.perl] Error 2
make: *** [install] Error 2

##</code><code>##

$> ./perl installperl --destdir=/Users/jeanluca/software/perl

##</code><code>##

$> export PERL5LIB=/Users/jeanluca/software/perl/usr/local/lib/perl5/5.10.0/
$> /Users/jeanluca/software/perl/usr/local/bin/cpan
-bash: /Users/jeanluca/software/perl/usr/local/bin/cpan: /usr/local/bin/perl: bad interpreter: No such file or directory

##</code><code>##

$> sh Configure -de