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dep-curl/docs/DEPENDENCIES.md
Viktor Szakats 0043b3fb8c
DEPENDENCIES.md: document minimum nettle version: 3.4.1 (2018-12-04) 
It comes as a transitive requirement by the minimum GnuTLS version.
Because libcurl uses nettle directly (in GnuTLS builds), I figure it is
useful to document explicitly.

Refs:
4353ea025a
https://github.com/curl/curl/pull/22456#discussion_r3695417678
https://github.com/gnutls/nettle/releases/tag/nettle_3.4.1_release_20181204

Closes #22457
2026-08-02 10:30:59 +02:00

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curl dependencies

Supported minimum versions of libs and build tools.

Portability

We write curl and libcurl to compile with C89 compilers on 32-bit and up machines. Most of libcurl assumes more or less POSIX compliance but that is not a requirement. The compiler must support a 64-bit integer type as well as supply a stdint.h header file that defines C99-style fixed-width integer types like uint32_t.

We write libcurl to build and work with lots of third party tools, and we want it to remain functional and buildable with these and later versions (older versions may still work but is not what we work hard to maintain):

Dependencies

We aim to support these or later versions:

  • brotli 1.0.0 (2017-09-21)
  • c-ares 1.16.0 (2020-03-13)
  • GnuTLS 3.6.5 (2018-12-01)
  • libidn2 2.0.0 (2017-03-29)
  • libgsasl 1.6.0 (2010-12-14)
  • libpsl 0.16.0 (2016-12-10)
  • LibreSSL 2.9.1 (2019-04-21)
  • libssh 0.9.0 (2019-06-28)
  • libssh2 1.9.0 (2019-06-20)
  • mbedTLS 3.2.0 (2022-07-11)
  • MIT Kerberos 1.3 (2003-07-31)
  • nettle 3.4.1 (2018-12-04)
  • nghttp2 1.15.0 (2016-09-25)
  • nghttp3 1.0.0 (2023-10-15)
  • ngtcp2 1.0.0 (2023-10-15), with OpenSSL 3.5.0+: 1.12.0 (2025-04-16)
  • OpenLDAP 2.0 (2000-08-01)
  • OpenSSL 3.0.0 (2021-09-07)
  • quiche 0.20.0 (2023-12-12)
  • Windows Vista 6.0 (2006-11-08 - 2012-04-10)
  • wolfSSL 5.0.0 (2021-11-01)
  • zlib 1.2.5.2 (2011-12-11)
  • zstd 1.0 (2016-08-31)

Build tools

When writing code (mostly for generating stuff included in release tarballs) we use a few "build tools" and we make sure that we remain functional with these or later versions:

  • clang-tidy 17.0.0 (2023-09-19), recommended: 19.1.0 (2024-09-17)
  • cmake 3.18 (2020-07-15)
  • GNU autoconf 2.59 (2003-11-06)
  • GNU automake 1.7 (2002-09-25)
  • GNU libtool 1.4.2 (2001-09-11)
  • GNU m4 1.4 (2007-09-21)
  • mingw-w64 3.0 (2013-09-20)
  • perl 5.8 (2002-07-19), on Windows: 5.22 (2015-06-01)
  • Visual Studio 2010 10.0 (2010-04-12 - 2020-07-14)

Testing

Certain tests require the following packages to operate. In some cases, tests that do not find the necessary requirements are automatically skipped.

  • OpenSSL (see above)
  • nghttp2 (see above)
  • OpenSSH
  • perl (see above)
  • pytest
  • Python 3.8 (2019-10-14)
  • stunnel