Constellation is a maven project, consequently it is compulsory to have maven (at least 2.0.9 version) installed in order to build Constellation.
If you have not already maven on your computer, you can download it freely at: maven.apache.org (Use version 2.0.9 or above)
Then navigate to the root folder of the project in a shell and enter :
The building process will begin. It takes a few minutes to do the full building.
If you want to disable tests execution (which may take time and not necessary interesting you), enter :
This step may take several minutes to fulfill. Maven will download different libraries from on line repositories, if necessary. Then you will get the following message in the end :
Result :