perl -MCPAN -e shell
[download]

CPAN.pm requires configuration, but most of it can be done automatical
+ly.
If you answer 'no' below, you will enter an interactive dialog for eac
+h
configuration option instead.

Would you like to configure as much as possible automatically? [yes] y
+es

 <install_help>

Warning: You do not have write permission for Perl library directories
+.

To install modules, you need to configure a local Perl library directo
+ry or
escalate your privileges.  CPAN can help you by bootstrapping the loca
+l::lib
module or by configuring itself to use 'sudo' (if available).  You may
+ also
resolve this problem manually if you need to customize your setup.

What approach do you want?  (Choose 'local::lib', 'sudo' or 'manual')
 [local::lib]


Autoconfiguration complete.

Attempting to bootstrap local::lib...

Writing /home/mh/.cpan/CPAN/MyConfig.pm for bootstrap...
commit: wrote '/home/mh/.cpan/CPAN/MyConfig.pm'
Fetching with LWP:
http://www.cpan.org/authors/01mailrc.txt.gz
Reading '/home/mh/.cpan/sources/authors/01mailrc.txt.gz'
......................................................................
+......DONE
Fetching with LWP:
http://www.cpan.org/modules/02packages.details.txt.gz
Reading '/home/mh/.cpan/sources/modules/02packages.details.txt.gz'
Out of memory!
Killed
[download]

On systems with a small memory footprint, use cpanm, Re^2: Should cpanminus be part of the standard Perl release?.

Also, if you really want to stay with cpan, you can (manually) install CPAN::SQLite and feed that from another machine with the updated index. But it's so much more convenient to use App::cpanminus instead ...

Re:

Out of memory! Killed

What's the RAM on that thing? (not flash). You can use:

free

and

cat /proc/meminfo

I am totally ignorant of these devices but my common sense says that if indeed this is a problem of running out of memory, you either install more RAM or make swap-space from disk space, including an inserted USB or other flash memories. If you want help with that let me know. You can check your disk-space (flash/hard disk/usb) like:

df -h

bw, bliako

If it's the same device as last time upgrading RAM is non trivial, if at all possible. For swap see Tutorials -> Embedded Perl: Installing Perl and Mojolicious on Arduino Yśn / OpenWRT ChaosCalmer. Simply avoiding using something as memory hungry as cpan is likely a simpler move.

Here are the specs: https://www.gl-inet.com/products/gl-ar300m