in reply to 'Dual-boot' Perl

The INSTALL file has directions for this.
By default, for most systems, perl will be installed in /usr/local/{bin, lib, man}. (See L<"Installation Directories"> and L<"Coexistence with earlier versions of perl5"> below for further details.)

You can specify a different 'prefix' for the default installation directory, when Configure prompts you or by using the Configure command line option -Dprefix='/some/directory', e.g.

sh Configure -Dprefix=/opt/perl

If your prefix contains the string "perl", then the suggested directory structure is simplified. For example, if you use prefix=/opt/perl, then Configure will suggest /opt/perl/lib instead of /opt/perl/lib/perl5/. Again, see L<"Installation Directories"> below for more details.

NOTE: You must not specify an installation directory that is the same as or below your perl source directory. If you do, installperl will attempt infinite recursion.

In Section Seekers of Perl Wisdom