I was trying to set prefix option for Getopt::Long but that produces the error message as if that option is unknown or I am doing something wrong (what exactly?) ... 

use v5.32;
use warnings;

use Getopt::Long;

printf qq[Version: perl %s, Getopt::Long %s\n],
   $^V,
   $Getopt::Long::VERSION;

#use Getopt::Long qw[:config debug prefix - ];
#
# Only difference is time, compile or run, of error ...
#
#   Getopt::Long: unknown or erroneous config parameter "prefix"
#
Getopt::Long::Configure( q[debug], q[prefix], q[-] );

__END__

Version: perl v5.36.3, Getopt::Long 2.52
Getopt::Long: unknown or erroneous config parameter "prefix"

[download]

... So how do I set the prefix string?

Got the same error with long_prefix_pattern configuration option. A search brings up issues with user options; did not see anything relevant to module configuration.

Linked to here on Mastodon.

In reply to Solved- Getopt::Long- Trying to specify "prefix" configuration option produces error by parv

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.