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+Get the list of your installed 5.8 modules:
+
+```sh
+% perl -MExtUtils::Installed -e'print join("\n", new ExtUtils::Installed->modules)' > module.list
+```
+
+then install Perl 5.10:
+
+```sh
+% wget http://www.cpan.org/src/perl-5.10.0.tar.gz
+% tar xzf perl-5.10.0.tar.gz
+% cd perl-5.10.0
+% sh Configure -de -Dprefix=/opt/perl -Duserelocatableinc
+% make && make test
+% sudo make install
+% /opt/perl/bin/perl -e 'use feature qw(say); say "hi"'
+```
+
+and then re-install your modules with <code>cpan \`cat module.list\`</code>.