I created my own tile server according to this instruction and my own layout/style with mapbox. Following the mentioned instruction I currently use OSM Bright as layout/style.

In short: How can I use my own mapbox generated layout with mapnik on my tile server?

In long: There seems to be nearly the same question asked here and it was answered (by @Schoenobates), but neither do I understand the answer, nor does the question opener ever marked this answer as correct or described what he has done to fix his problem.

My humble try to fix it (so far): According to the instructions the main part of configuring mapnik/renderd to use the OSM Bright layout seems to be the following line of code carto project.mml > OSMBright.xml. But my mapbox generated layout does not contain a file with the ending .mml. There is a generated .xml file within my mapbox project folder, but using this as a replacement of OSMBright.xml does not seem to work.