When I downloaded mapedit from 
  ftp://sunsite.unc.edu/pub/packages/infosystems/WWW/tools/mapedit,
I had an Imakefile.  To make that into a Makefile, run Tom's xmake
program.  A link is now in your bin directory.

Actually, for mapedit, I had to change the gcc (GNU's c compiler)
in the makefile to cc.  The steps were
  xmake         To make the Makefile.
  vi Makefile   To change gcc to cc.
  make          To make the mapedit executable.