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@deftypefun {const char *} {gnutls_check_version} (const char * @var{req_version})
@var{req_version}: version string to compare with, or @code{NULL} .
Check the GnuTLS Library version against the provided string.
See @code{GNUTLS_VERSION} for a suitable @code{req_version} string.
See also @code{gnutls_check_version_numeric()} , which provides this
functionality as a macro.
@strong{Returns:} Check that the version of the library is at
minimum the one given as a string in @code{req_version} and return the
actual version string of the library; return @code{NULL} if the
condition is not met. If @code{NULL} is passed to this function no
check is done and only the version string is returned.
@end deftypefun
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