Checking --with / --enable values

[John Levon]

Is there a way to error out if user enters --with-speling instead of
--with-spelling ? I believe this is allowed silently to allow configure
scripts to pass arguments to sub-scripts, but shouldn't there at least
be an option to  turn on such  sanity checking if wanted ?

thanks
john
-- 
"History is the slaughter-bench at which the happiness of peoples, the
 wisdom of states and the virtue of individuals have been sacrificed."
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