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The explanatory parts are now in the everything curl book (which can also use images etc). This document now refers to that resource and only leaves listings of supported versions of libs, tools and operating systems. See https://everything.curl.dev/internals Closes #8467
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curl internals
The canonical libcurl internals documentation is now in the everything curl book. This file lists supported versions of libs, tools and operating systems.
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.
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.
- OpenSSL 0.9.7
- GnuTLS 3.1.10
- zlib 1.1.4
- libssh2 1.0
- c-ares 1.16.0
- libidn2 2.0.0
- wolfSSL 2.0.0
- openldap 2.0
- MIT Kerberos 1.2.4
- GSKit V5R3M0
- NSS 3.14.x
- Heimdal ?
- nghttp2 1.12.0
- WinSock 2.2 (on Windows 95+ and Windows CE .NET 4.1+)
Operating Systems
On systems where configure runs, we aim at working on them all - if they have a suitable C compiler. On systems that do not run configure, we strive to keep curl running correctly on:
- Windows 98
- AS/400 V5R3M0
- Symbian 9.1
- Windows CE ?
- TPF ?
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 versions:
- GNU Libtool 1.4.2
- GNU Autoconf 2.57
- GNU Automake 1.7
- GNU M4 1.4
- perl 5.004
- roffit 0.5
- groff ? (any version that supports
groff -Tps -man [in] [out])