.IP CURL_VERSION_CONV
libcurl was built with support for character conversions, as provided by the
CURLOPT_CONV_* callbacks. (Added in 7.15.4)
+.IP CURL_VERSION_TLSAUTH_SRP
+libcurl was built with support for TLS-SRP. (Added in 7.21.4)
+.IP CURL_VERSION_NTLM_WB
+libcurl was built with support for NTLM delegation to a winbind helper.
+(Added in 7.22.0)
.RE
\fIssl_version\fP is an ASCII string for the OpenSSL version used. If libcurl
has no SSL support, this is NULL.