This buildfile is part of projectlombok.org. It responsible for finding, downloading, and updating the lombok.patcher dependency. You don't have any version of lombok-patcher.jar installed. Run 'ant installDeps' to fix this. ** UPDATED: ${lombok.patcher.fileloc} You don't have the lombok.patcher dependency. I can grab the lombok.patcher project form version control. If you want me to do so, I will put the project in a sibling directory next to your 'lombok' project directory. Otherwise, I can grab a copy from the internet, though it won't be as up-to-date, and may thus be insufficient to run the very latest lombok. Pick one (first letter will do): Skip - Skips this download. This dependency is not optional, so your lombok won't compile. Get - Grabs the latest version of lombok.patcher from source control. Download - Downloads the latest version from the internet, and will not be as up to date as 'get'. You only have the lombok.patcher dependency as a downloaded file, which won't be as cutting edge as grabbing it from version control. Do you want to grab lombok.patcher from source control? I will put the project in a sibling directory next to your 'lombok' directory. Pick one (first letter will do): Skip - Skips this download, and continues to rely on the occasionally updated web version. Get - Grabs the latest version of lombok.patcher from source control. Lombok will start using this instead. Cloning ${lombok.patcher.giturl} into ${lombok.patcher.dir} Done! lombok-patcher.jar will now be resolved from this cloned repository. You may want to import this project into your eclipse workspace as well. Updating existing git repository of lombok.patcher... Downloading lombok-patcher.jar from the internet... Updating existing lombok-patcher.jar from the internet...