This directory contains short driver programs optimized for running the lzw compression and decompression code through a fuzzer, specifically AFL - American Fuzzy Lop.
You need to install AFL, or one of its forks.
The original AFL hasn't seen updates in a long time, but AFL++ should also work, but is untested at this time.
Simply run make fuzz or make fuzz-<name>-driver to build the corresponding driver and start AFL.
NOTE: It's recommended to run fuzzing on /tmp (or another RAM disk), since AFL does a lot of disk writes.