$ ls
.env
cpanfile
cpanfile.snapshot
app.psgi
lib/
vendor/
Procfile

$ cat cpanfile
requires 'Plack', '1.0000';
requires 'DBI', '1.6';

$ cat Procfile
# PERL5LIB=local/lib/perl5 is for compatiblity to Dokku.
web: PERL5LIB=local/lib/perl5 carton exec starman --preload-app --port \$PORT

$ cat .env
# custom buildpack url for Dokku
export BUILDPACK_URL=https://github.com/sng2c/heroku-buildpack-perlcarton.git

$ heroku create --stack cedar --buildpack https://github.com/sng2c/heroku-buildpack-perlcarton.git

$ git push heroku master
...
-----> Heroku receiving push
-----> Fetching custom buildpack
-----> Perl/Carton app detected
...