Requesting feedback on my makefile

[Richard Cavell]

   Hello everyone,

   I have created a small project on github.  It is a humble (and
   unfinished) word-wrapping algorithm written in C, currently consisting
   of 5 source files and 5 headers.  I have been reading the book
   "Managing Projects with GNU Make", and I have composed a makefile that
   seems to do the job.  I would appreciate it if someone could review my
   makefile and tell me if they have any suggestions for improvement.
   I'll learn more if you let me do the work.  Thanks.

   https://github.com/richardcavell/wrap