How do I define new make tasks, using `Makefile.PL`? - perl

Question

I would like my generated Makefile to have these new tasks for linting:
perl:
-for f in **/*.pl; do perl -MO=Lint -cw $$f 2>&1 | grep -v "syntax OK"; done
-for f in **/*.pm; do perl -MO=Lint -cw $$f 2>&1 | grep -v "syntax OK"; done
perlcritic:
-perlcritic . | grep -v "source OK"
lint: perl perlcritic
I tried writing a Makefile.PL, but when I run it, the resulting Makefile still lacks the lint task.
use ExtUtils::MakeMaker;
sub MY::lint {
return <<'END';
lint:
echo "Linting!!!!!!!!!!!1"
END
}
WriteMakefile;
I tried reading the CPAN docs, but like most docs, they give snippets without sufficient context, so I'm not even sure if I should declare the subs before or after WriteMakefile.
Also posted on Reddit.

Answer 1

Thanks to briandfoy:
$ cat Makefile.PL
#!/usr/bin/env perl
use strict;
use warnings;
use ExtUtils::MakeMaker;
WriteMakefile;
sub MY::postamble {
return <<'END';
perlwarn:
-find . -type f -name '*.pl' -exec perl -MO=Lint -cw {} 2>&1 \; | grep -v "syntax OK" | grep -v "Can't locate"
-find . -type f -name '*.pm' -exec perl -MO=Lint -cw {} 2>&1 \; | grep -v "syntax OK" | grep -v "Can't locate"
-find . -type f -name '*.t' -exec perl -MO=Lint -cw {} 2>&1 \; | grep -v "syntax OK" | grep -v "Can't locate"
perlcritic:
-perlcritic . | grep -v "source OK"
lint: perlwarn perlcritic
END
}

Answer 2

A solution that works and is slightly easier to maintain is to put the make targets in a separate makefile, so you can benefit of your text editor capabilities and it is a bit easier to read:
# In Makefile.PL
use File::Slurp;
sub MY::postamble {
my $targets = read_file('./script/additional.make');
return $targets;
}
# In /script/additional.make
perl:
for f in **/*.pl; do perl -MO=Lint -cw $$f 2>&1 | grep -v "syntax OK"; done
for f in **/*.pm; do perl -MO=Lint -cw $$f 2>&1 | grep -v "syntax OK"; done
perlcritic:
perlcritic . | grep -v "source OK"
lint: perl perlcritic
Note for later readers: I am using Module::Install and it was necessary to use :: as separators because it seems that Module::Install forbid to mix : and ::. It also disallow the use of -.