--with-nss is set but not "yes".

  I think we can still improve that to check for pkg-config in that path etc,
  but at least this patch brings back the same functionality we had before.

  during configure.

is only expanded and included once in the configure script.

Check for basename() is now done the same as other function checks

statically linking since libssh2 needs the SSL library link flags to be
set up already to satisfy its dependencies. This wouldn't be necessary
if the libssh2 configure check was changed to use pkg-config since the
--static flag would add the dependencies automatically.

  when cross-compiling. The key to success is then you properly setup
  PKG_CONFIG_PATH before invoking configure.

  I also improved how NSS is detected by trying nss-config if pkg-config isn't
  present, and as a last resort just use the lib name and force the user to
  setup the LIBS/LDFLAGS/CFLAGS etc properly. The previous last resort would
  add a range of various libs that would almost never be quite correct.

  properly and provided a fix. http://curl.haxx.se/bug/view.cgi?id=2843008

renamed generated config.h to curl_config.h in order to avoid clashes when libcurl is used with other projects which also have a config.h.

doesn't work, to better fine older gnutls installs

Refactor how libraries are checked for connect() function,
and check for connect() as it is done for other functions.

socket() and closesocket() prototypes might be in socket.h

check for socket() and closesocket() as it is done for other functions

with the low-level curl debug memory tracking 'feature' to allow decoupled
setting from --enable-debug.

  to detect gnutls build options with pkg-config only and not libgnutls-config
  anymore since GnuTLS has stopped distributing that tool. If an explicit path
  is given to configure, we will instead guess on how to link and use that
  lib. I did not use the patch from the bug report.

Revert delegating c-ares linking magic on libtool and auto-makefiles when using
the uninstalled c-ares libtool archive built from the CVS embedded tree.

This embedded c-ares linking is again handled from the configure script.

  without pkg-config.

Delegate c-ares linking magic on libtool and auto-makefiles when using
the uninstalled c-ares libtool archive built from the CVS embedded tree.

Not actually needed to simply include some files in the distribution tarball.

attempt in generated config.h

This will be removed in 24 or 48 hours.

setup_once.h.  Inclusion of each header file is based on the definition of
NEED_MALLOC_H and NEED_MEMORY_H respectively.