Heroku - how to enable gd on heroku php application?

Heroku - how to enable gd on heroku php application?

php heroku gd

heroku

How to install GD on Heroku

php laravel heroku gd

heroku

Fatal error: Call to undefined function: imagejpeg() on Heroku PHP. Fix?

php heroku gd

heroku

heroku installing gd extension failed

php heroku gd

heroku

trying to install ext-gd on heroku

php laravel heroku laravel-5.2 gd

heroku

How can I add jpeg support to Heroku PHP buildpack

php heroku gd php-ini

heroku