he current version of cgicc has macros that test things like name spaces and 
is GPL. Unless there are problems with the GPL that prohbits LyX from stealing 
them this would seem to be the obvious solution. (All these feature test 
macros, and 99% of the autoconf macros, do is try to compile a minimal program 
with the function, header, feature or whatever).

My test for snprinntf ignoring n, in the checkps (http://checkps.alcom.co.uk) 
autoconf script, writes a minimal program and runs it.
-- 
Duncan (-:
"software industry, the: unique industry where selling substandard goods is
legal and you can charge extra for fixing the problems."

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