heroku with lesscss more plugin

Something just happened at heroku. They used to provide an environment variable HEROKU_ENV, but for some reason its not there anymore.

This is a problem only because the more plugin for lesscss used the presence of that environment variable to test for heroku. Now, all my apps on Heroku using more are failing.

so, for those of you with the same problem, here is a quick fix:

heroku config:add HEROKU_ENV=production