$ cat ../lib/MyLib.pm
package MyLib;

our $VERSION = '1.23';

1;

$ perl -T -e 'use FindBin 1.51 qw( $RealBin ); use lib "$RealBin/../lib"; use MyLib; print $MyLib::VERSION;'
Insecure dependency in require while running with -T switch at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl -T -e 'use FindBin 1.51 qw( $RealBin ); use lib @{["$RealBin/../lib" =~ /^([\$\w\/.]+)$/ && $1]}; use MyLib; print $MyLib::VERSION;'
1.23

##</code><code>##

$ perl -T -e 'use FindBin 1.51 qw( $RealBin ); use lib @{["$RealBin/../lib" =~ /^([\$\w\/.]+)$/]}; use MyLib; print $MyLib::VERSION;'
1.23