Here is the xml windows config if you want to paste it into .idea/watcherTasks.xml

jetbrain-compass-watcher.xml

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
    <component name="ProjectTasksOptions">
        <TaskOptions isEnabled="true">
            <option name="arguments" value="compile $FileParentDir$" />
            <option name="checkSyntaxErrors" value="true" />
            <option name="description" value="Compiles .scss files into .css files" />
            <option name="exitCodeBehavior" value="ERROR" />
            <option name="fileExtension" value="scss" />
            <option name="immediateSync" value="true" />
            <option name="name" value="Compass" />
            <option name="output" value="" />
            <option name="outputFilters">
                <array />
            </option>
            <option name="outputFromStdout" value="false" />
            <option name="passParentEnvs" value="true" />
            <option name="program" value="C:\Ruby22-x64\bin\compass" />
            <option name="scopeName" value="Project Files" />
            <option name="trackOnlyRoot" value="true" />
            <option name="workingDir" value="$Projectpath$" />
            <envs />
        </TaskOptions>
    </component>
</project>