Snap is a cross-distribution packaging format for Linux. See https://snapcraft.io for more information.
Just type
snapcraft
from the parent directory: that is, not from the directory containing this README file, but from its parent directory. This snap has been successfully built in Ubuntu 16.04; more recent Ubuntu versions should work as well. Note that, regardless of the environment used to build it, the generated snap package will work on any distribution where snap is installed.
The generated snap can be installed by typing
snap install --dangerous ./openmvg*.snap
The --dangerous flag is needed because the snap has not been verified by the
store.
A thorough guide can be found at the snapcraft.io site.