Lighttpd

I build gnutls with:
[gnutls-3.4.2]$ ./configure -C --enable-openssl-compatibility --disable-non-suiteb-curves
http://osdir.com/ml/general/2016-02/msg40458.html
suggested --disable-non-suiteb-curves on systems with nettle without
secp192 and secp224 curves

However, concerns have been raised about using gnutls, which (BTW) is no longer associated with the GNU Foundation.

http://www.zdnet.com/article/gnutls-big-internal-bugs-few-real-world-problems/
(published in 2014) suggests that GnuTLS might not be the best choice in
TLS libraries, questioning some of its design limitations. Caveat emptor.
(Alternatives include OpenSSL, LibreSSL, BoringSSL, wolfSSL, mbed TLS, ...)

gnutls does not provide compatible headers to openssl, even when gnutls is configured --enable-openssl-compatibility. Combined with the above design criticisms (link), is adding support for GnuTLS still worth the effort?

I have tested lighttpd with openssl and libressl. Other implementations which supply openssl-compatible headers and interfaces are also likely to work with lighttpd with little to no extra effort.

Update: mod_openssl has been separated from the rest of lighttpd since lighttpd 1.4.46.

In my development branch, personal/gstrauss/master, I ported other lighttpd use of libcrypto to use libnettle if lighttpd is built with ./configure --with-nettle

libgnutls depends on libnettle.

Creating a mod_gnutls.c is now possible as an isolated task which duplicates the functionality of mod_openssl.c, using GnuTLS instead of OpenSSL.

Applied in changeset bf4054f8ecb7ce88118a4e3631a617dba0600da0.