The EECS 281 syllabus states that all submitted programs must compile and run using the CAEN Linux computing environment's GCC version 5.1.0 compiler.
The previous Makefile was written to use GCC version 4.8.2, which does not exist in the current CAEN environment. The environment defaults to GCC version 4.8.3, requiring the user to manually load the GCC/5.1.0 module after every login.
The Makefile's PATH variables were thus modified to use the expected GCC version 5.1.0 by default.
No other significant modifications were made.