unison-fsmonitor-0.2.2 is not a library.
unison-fsmonitor
Why
unison doesn't include unison-fsmonitor for macOS, thus -repeat watch option doesn't work out of the box. This utility fills the gap.
Install
Alternatively if you have cargo installed,
Usage
Simply run unison with -repeat watch as argument or repeat=watch in config file.
Increase file watch limit on macOS
See https://facebook.github.io/watchman/docs/install.html#mac-os-file-descriptor-limits
Debug
RUST_LOG=debug unison