"Randy Eastland" <randy.eastland at gmail.com> writes:
     no usable m4 in $path  or /usr/5bin
  
  I've seen this error addressed in the context of Linux systems, but not with
  Windows.
  
The trick is the same on GNU/Linux as on Windoze: Install m4 (and the
other build tools mentioned in the GMP manual).
-- 
Torbjörn