AC_SUBST and unnecessarily large make files

[Mr E_T]

I have noticed that when creating a project with large numbers of Makefiles that
there are a large number of unnecessary variables.

Would it not be better to create a list of required variables and then a list 
of 
optional variables - scan the Makefile.am for $(variable) ( not @variable@ ) and
then insert only the required ones ?

While this may not be a problem with small projects - the overall effect for a 
large project is to slow the Makefile creation process.

-- 
regs conon
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