New upstream version 2.3

REQUIREMENTS

@@ -11,6 +11,22 @@ check_ldaps, check_http --ssl, check_tcp --ssl, check_smtp --starttls
 	- Requires openssl or gnutls libraries for SSL connections
 	  http://www.openssl.org, http://www.gnu.org/software/gnutls
 
+check_curl:
+	- Requires libcurl 7.15.2 or later
+	  http://www.haxx.se
+	- --ssl/-S and -C requires OpenSSL for certificate checks, otherwise
+	  libcurl must be quite new to support CURLINFO_CERTINFO with
+	  GnuTLS and NSS libraries:
+	  - 7.42.0 or newer for GnuTLS
+	  - 7.34.0 or newer for NSS
+	  GnuTLS is known to create problems on some distributions with
+	  self-signed certificate chains
+	  http://www.openssl.org, http://www.gnu.org/software/gnutls,
+	  http://www.mozilla.org/projects/security/pki/nss/,
+	  other SSL implementations are currently not supported
+	- uriparser 0.7.5 or later
+	  https://uriparser.github.io/
+      
 check_fping:
 	- Requires the fping utility distributed with SATAN.  Either
 	  download and install SATAN or grab the fping program from