Ask your system administrator to install it from http://sunfreeware.com. Alternatively, download the tarball and compile and install it yourself.

Also, have you checked whether Perl 5.8.4 is already installed?

> uname -a
SunOS secrethost 5.10 Generic_142901-02 i86pc i386 i86pc
> perl -v
This is perl, v5.8.4 built for i86pc-solaris-64int
(with 32 registered patches, see perl -V for more detail)

Copyright 1987-2004, Larry Wall

Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 5 source ki
+t.

Complete documentation for Perl, including FAQ lists, should be found 
+on
this system using `man perl' or `perldoc perl'.  If you have access to
+ the
Internet, point your browser at http://www.perl.com/, the Perl Home Pa
+ge.
[download]

There is no good technical reason not to compile one's own Perl under Solaris 10. Sun now includes GCC 3.4.3, GNU assembler 2.15, GNU Make 3.80, etc. In the past, I had to deal with fighting with SUN's assembler, maybe even compiling GCC, GAS, etc. Compiling Perl 5.10.1 was tame and virtually painless in comparison. So, your own Perl is the way to go under Solaris 10!!

For anyone curious, below (in the readmore tags) is the TCSH script I used to set up my environment and a copy of the myconfig file.

Read more... (4 kB)

Elda Taluta; Sarks Sark; Ark Arks

As Corion points out, Perl 5.8.4 is installed by default with Solaris 10, as you already know from this thread. You can also download the source of older versions of Perl on CPAN.