The fsnotifier is used by IntelliJ for detecting file changes. This version supports FreeBSD and OpenBSD via libinotify and is a replacement for the bundled Linux-only version coming with the IntelliJ IDEA Community Edition.
To compile run make. Copy fsnotifier somewhere.
Edit bin/idea.properties in your IntelliJ distribution and add:
idea.filewatcher.executable.path=/path/to/your/fsnotifier