My problem is: I can't find a way to compare strings in C preprocessor directive since PG_VERSION is defined as something like "7.4.3" or "7.4.6".
You could try using CATALOG_VERSION_NO in src/include/catversion.h as a substitute for the version number.
I think it would probably be a good idea to add a PG_VERSION-workalike that is more amenable to use with cpp, though.
-Neil
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