What Version of Sakai?
The build instructions differ slightly according to the version of Sakai you are using.
Prior to Sakai Version 2.2
Most likey, 'Prior to Version 2.2' is another way of saying 'versions up to and including Sakai 2.1.2'. Here you should be sure that you are working with the correct version of the SCORM Tool as there are code differences between Sakai 2.1.2 and 2.2.
The last version of the SCORM Tool that works with Sakai v2.1.2 is, understandably, version 2.1.2. Make sure you have this version by checking for a tag with 2-1-2 in the name here: https://source.sakaiproject.org/contrib/scorm/runtime_tool/tags