Hello,

I use autoconf in my project, thus I check for cURL presence by calling
LIBCURL_CHECK_CONFIG() and then testing "$LIBCURL" value. So far good.

Now I need check for specific cURL version in addition to know whether I need
a work-around in my application for a cURL bug that will be fixed in upcoming
7.28.0 version.

Thus I added second LIBCURL_CHECK_CONFIG() call in form:

LIBCURL_CHECK_CONFIG(
    [],
    [7.28.0],
    AC_MSG_WARN([Not affected]),
    AC_MSG_WARN([Affected]
)

When running such configure, I get correct report about not having 7.28.0
version, but then I always get the ACTION-IF-YES branch evaluated.

I think this is because of caching used inside LIBCURL_CHECK_CONFIG() macro.

Am I right LIBCURL_CHECK_CONFIG() is not re-entrant? What do you recommend?
I wanted to prevent from running curl-config manually. However I see now you
have handy `--checkfor' curl-config option. Can I assume if
LIBCURL_CHECK_CONFIG() presents, then curl-config executable will be available
too?

-- Petr

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