For perl 

This is perl 5, version 40, subversion 0 (v5.40.0) built for
x86_64-linux-gnu-thread-multi
(with 43 registered patches, see perl -V for more detail)

Copyright 1987-2024, Larry Wall

  the line

use File::Spec qw/splitpath/;

  needs to be

use File::Spec;

  to avoid a warning

  The same for a similar line.

  GROFF    doc/automake.pdf
Attempt to call undefined import method with arguments ("splitpath") via
package "File::Spec" (Perhaps you forgot to load the package?) at
/home/bg/git/groff/build/pdfmom line 27.

-.-

  The size of created files stays the same.

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