Make - What is Efl?

[Bruce Jilek]

In _Make - A Program for Maintaining Computer Programs_ by S.I. Feldman
(Unix Programmer's Manual 7th ed., vol. 2), a program suffix '.e' is
described.  It means that the source is an Efl source file.

What is 'Efl'.  Sorry if this is old material.  I discovered that I didn't
know 'make' as well as I thought, and studying this paper brought up the
question.

Bruce Jilek