library version number

[Philip Herron]

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Hey

Just wondering it would be nice if i could in my configure.ac check for
the library version.

For one of the libraries i am use its libxml2 and the only way i know of
getting the version number linker flags etc is it comes with its own
pkg-config style app xml2-config.

Is there a way even to run xml2-config --version and return the variable
inside my configure.ac or is there a better macro for this :S

- -Phil
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