Replace LINUX_VERSION with the Linux distribution you wish to use.

docker build -f Dockerfile.LINUX_VERSION -t openmw.LINUX_VERSION .

Labeling systems like SELinux require that proper labels are placed on volume content mounted into a container. Without a label, the security system might prevent the processes running inside the container from using the content. The Z option tells Docker to label the content with a private unshared label.

docker run -v /path/to/openmw:/openmw:Z -e NPROC=2 -it openmw.LINUX_VERSION