Standard LEX variable doesn't work in Make.

[Kaz Kylheku]

Hi,

I'm changing a FOSS project to rely more on standard Make
vars such as CC and CFLAGS and such: use $(CC) for
the compiler unless told otherwise, incorporate $(CFLAGS)
if it is defined, and so forth. This is friendly toward
distro package maintainers.

Anyway, even though my Cygwin installation has GNU Flex,
the lex command is nonexistent; thus the $(LEX) Make
variable fails.

Either LEX should go to "flex", or there should be a
"lex" alias.

If the installation has some sort of lex, the
predefined $(LEX) variable should resolve to it.



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