This version seems usable enough to be 1.0.
-rw-r--r-- 62 .gitignore
-rw-r--r-- 1527 Makefile
-rw-r--r-- 3548 finddup.1
-rw-r--r-- 15616 finddup.c
-rw-r--r-- 35147 gpl-3.0.txt