in reply to Can I install CPAN itself on busybox?

(@INC contains: /usr/lib/perl5/5.22 .) at Makefile.PL line 1.

Looks like a broken perl build to me, @INC having too little entries.
Do you have /usr/lib/perl, /usr/share/perl and/or /usr/share/perl5 in your FS? If so, add them to @INC running perl -Idirectory (multiple -I possible).

You could run find / -name strict.pm, see if it turns up and add its directory to @INC. Also, locate Config.pm and do likewise.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In Section Seekers of Perl Wisdom