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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH curl_version_info 3 "2 Nov 2014" "libcurl 7.40.0" "libcurl Manual"
+.SH NAME
+curl_version_info - returns run-time libcurl version info
+.SH SYNOPSIS
+.B #include <curl/curl.h>
+.sp
+.BI "curl_version_info_data *curl_version_info( CURLversion "age ");"
+.ad
+.SH DESCRIPTION
+Returns a pointer to a filled in static struct with information about various
+features in the running version of libcurl. \fIage\fP should be set to the
+version of this functionality by the time you write your program. This way,
+libcurl will always return a proper struct that your program understands,
+while programs in the future might get a different
+struct. \fBCURLVERSION_NOW\fP will be the most recent one for the library you
+have installed:
+
+        data = curl_version_info(CURLVERSION_NOW);
+
+Applications should use this information to judge if things are possible to do
+or not, instead of using compile-time checks, as dynamic/DLL libraries can be
+changed independent of applications.
+
+The curl_version_info_data struct looks like this
+
+.nf
+typedef struct {
+  CURLversion age;          /* see description below */
+
+  /* when 'age' is 0 or higher, the members below also exist: */
+  const char *version;      /* human readable string */
+  unsigned int version_num; /* numeric representation */
+  const char *host;         /* human readable string */
+  int features;             /* bitmask, see below */
+  char *ssl_version;        /* human readable string */
+  long ssl_version_num;     /* not used, always zero */
+  const char *libz_version; /* human readable string */
+  const char * const *protocols; /* protocols */
+
+  /* when 'age' is 1 or higher, the members below also exist: */
+  const char *ares;         /* human readable string */
+  int ares_num;             /* number */
+
+  /* when 'age' is 2 or higher, the member below also exists: */
+  const char *libidn;       /* human readable string */
+
+  /* when 'age' is 3 or higher (7.16.1 or later), the members below also
+     exist  */
+  int iconv_ver_num;       /* '_libiconv_version' if iconv support enabled */
+
+  const char *libssh_version; /* human readable string */
+
+  /* when 'age' is 4 or higher (7.57.0 or later), the members below also
+     exist  */
+  unsigned int brotli_ver_num; /* Numeric Brotli version
+                                  (MAJOR << 24) | (MINOR << 12) | PATCH */
+  const char *brotli_version; /* human readable string. */
+
+  /* when 'age is CURLVERSION_SIXTH or alter (7.66.0 or later), these fields
+     also exist */
+  unsigned int nghttp2_ver_num; /* Numeric nghttp2 version
+                                   (MAJOR << 16) | (MINOR << 8) | PATCH */
+  const char *nghttp2_version; /* human readable string. */
+
+  const char *quic_version;    /* human readable quic (+ HTTP/3) library +
+                                  version or NULL */
+
+} curl_version_info_data;
+.fi
+
+\fIage\fP describes what the age of this struct is. The number depends on how
+new the libcurl you're using is. You are however guaranteed to get a struct
+that you have a matching struct for in the header, as you tell libcurl your
+"age" with the input argument.
+
+\fIversion\fP is just an ascii string for the libcurl version.
+
+\fIversion_num\fP is a 24 bit number created like this: <8 bits major number>
+| <8 bits minor number> | <8 bits patch number>. Version 7.9.8 is therefore
+returned as 0x070908.
+
+\fIhost\fP is an ascii string showing what host information that this libcurl
+was built for. As discovered by a configure script or set by the build
+environment.
+
+\fIfeatures\fP can have none, one or more bits set, and the currently defined
+bits are:
+.RS
+.IP CURL_VERSION_ALTSVC
+HTTP Alt-Svc parsing and the associated options (Added in 7.64.1)
+.IP CURL_VERSION_ASYNCHDNS
+libcurl was built with support for asynchronous name lookups, which allows
+more exact timeouts (even on Windows) and less blocking when using the multi
+interface. (added in 7.10.7)
+.IP CURL_VERSION_BROTLI
+supports HTTP Brotli content encoding using libbrotlidec (Added in 7.57.0)
+.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_CURLDEBUG
+libcurl was built with memory tracking debug capabilities. This is mainly of
+interest for libcurl hackers. (added in 7.19.6)
+.IP CURL_VERSION_DEBUG
+libcurl was built with debug capabilities (added in 7.10.6)
+.IP CURL_VERSION_GSSAPI
+libcurl was built with support for GSS-API. This makes libcurl use provided
+functions for Kerberos and SPNEGO authentication. It also allows libcurl
+to use the current user credentials without the app having to pass them on.
+(Added in 7.38.0)
+.IP CURL_VERSION_GSSNEGOTIATE
+supports HTTP GSS-Negotiate (added in 7.10.6)
+.IP CURL_VERSION_HTTPS_PROXY
+libcurl was built with support for HTTPS-proxy.
+(Added in 7.52.0)
+.IP CURL_VERSION_HTTP2
+libcurl was built with support for HTTP2.
+(Added in 7.33.0)
+.IP CURL_VERSION_HTTP3
+HTTP/3 and QUIC support are built-in (Added in 7.66.0)
+.IP CURL_VERSION_IDN
+libcurl was built with support for IDNA, domain names with international
+letters. (Added in 7.12.0)
+.IP CURL_VERSION_IPV6
+supports IPv6
+.IP CURL_VERSION_KERBEROS4
+supports Kerberos V4 (when using FTP)
+.IP CURL_VERSION_KERBEROS5
+supports Kerberos V5 authentication for FTP, IMAP, POP3, SMTP and SOCKSv5 proxy
+(Added in 7.40.0)
+.IP CURL_VERSION_LARGEFILE
+libcurl was built with support for large files. (Added in 7.11.1)
+.IP CURL_VERSION_LIBZ
+supports HTTP deflate using libz (Added in 7.10)
+.IP CURL_VERSION_MULTI_SSL
+libcurl was built with multiple SSL backends. For details, see
+\fIcurl_global_sslset(3)\fP.
+(Added in 7.56.0)
+.IP CURL_VERSION_NTLM
+supports HTTP NTLM (added in 7.10.6)
+.IP CURL_VERSION_NTLM_WB
+libcurl was built with support for NTLM delegation to a winbind helper.
+(Added in 7.22.0)
+.IP CURL_VERSION_PSL
+libcurl was built with support for Mozilla's Public Suffix List. This makes
+libcurl ignore cookies with a domain that's on the list.
+(Added in 7.47.0)
+.IP CURL_VERSION_SPNEGO
+libcurl was built with support for SPNEGO authentication (Simple and Protected
+GSS-API Negotiation Mechanism, defined in RFC 2478.) (added in 7.10.8)
+.IP CURL_VERSION_SSL
+supports SSL (HTTPS/FTPS) (Added in 7.10)
+.IP CURL_VERSION_SSPI
+libcurl was built with support for SSPI. This is only available on Windows and
+makes libcurl use Windows-provided functions for Kerberos, NTLM, SPNEGO and
+Digest authentication. It also allows libcurl to use the current user
+credentials without the app having to pass them on. (Added in 7.13.2)
+.IP CURL_VERSION_TLSAUTH_SRP
+libcurl was built with support for TLS-SRP. (Added in 7.21.4)
+.IP CURL_VERSION_UNIX_SOCKETS
+libcurl was built with support for Unix domain sockets.
+(Added in 7.40.0)
+.RE
+\fIssl_version\fP is an ASCII string for the TLS library name + version
+used. If libcurl has no SSL support, this is NULL. For example "Schannel",
+\&"SecureTransport" or "OpenSSL/1.1.0g".
+
+\fIssl_version_num\fP is always 0.
+
+\fIlibz_version\fP is an ASCII string (there is no numerical version). If
+libcurl has no libz support, this is NULL.
+
+\fIprotocols\fP is a pointer to an array of char * pointers, containing the
+names protocols that libcurl supports (using lowercase letters). The protocol
+names are the same as would be used in URLs. The array is terminated by a NULL
+entry.
+.SH RETURN VALUE
+A pointer to a curl_version_info_data struct.
+.SH "SEE ALSO"
+\fIcurl_version(3)\fP