a project needs to satisfy both gcc 4.1.2 and gcc 4.7.3, but some options
in the latter one(like -Wno-narrowing and Wno-unused-result) cannot be used
in the former one. So I need to test the cutrrent gcc version and decide
what can of option can be assigned to CFLAGS, sth like:

if gcc version == 4.1.2
CFLAGS=....
else
CFLAGS =.....

how can I implement it in configure.ac?
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