My first attempt at documenting what we try to support and make curl run with

 Tagging shall be used extensively, and by the time we release new archives we

 should tag the sources with a name similar to the released version number.

Portability

===========

 We write curl and libcurl to compile with C89 compilers.  On 32bit and up

 machines. Most of libcurl assumes more or less POSIX compliance but that's

 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):

 OpenSSL      0.9.6

 GnuTLS       1.2

 zlib         1.1.4

 libssh2      0.16

 c-ares       1.5.0

 libidn       0.4.1

 *yassl       1.4.0 (http://curl.haxx.se/mail/lib-2008-02/0093.html)

 openldap     2.0

 MIT krb5 lib 1.2.4

 qsossl       V5R2M0

 Heimdal      ?

 NSS          ?

 * = only partly functional, but that's due to bugs in the third party lib, not

     because of libcurl code

 On systems where configure runs, we aim at working on them all - if they have

 a suitable C compiler. On systems that don't run configure, we strive to keep

 curl running fine on:

 Windows      98

 AS/400       V5R2M0

 Symbian      9.1

 Windows CE   ?

 TPF          ?

Windows vs Unix

===============