option('gnutls', type: 'feature', value: 'auto', description: 'support for GnuTLS networking configration')
option('openssl', type: 'feature', value: 'disabled', description: 'support for OpenSSL networking configration')
option('libproxy', type: 'feature', value: 'auto', description: 'support for libproxy proxy configration')
option('gnome_proxy', type: 'feature', value: 'auto', description: 'support for GNOME desktop proxy configuration')
option('installed_tests', type: 'boolean', value: false, description: 'enable installed tests')
option('static_modules', type: 'boolean', value: false, description: 'build static modules')

# The OpenSSL backend is provided for systems where licensing considerations
# prohibit use of certain dependencies of GnuTLS. General-purpose Linux distros
# should leave it disabled. Please don't second-guess our defaults.
option('gnutls', type: 'feature', value: 'auto', description: 'support for GnuTLS networking configration')
option('openssl', type: 'feature', value: 'disabled', description: 'support for OpenSSL networking configration')
option('libproxy', type: 'feature', value: 'auto', description: 'support for libproxy proxy configration')
option('gnome_proxy', type: 'feature', value: 'auto', description: 'support for GNOME desktop proxy configuration')
option('installed_tests', type: 'boolean', value: false, description: 'enable installed tests')
option('static_modules', type: 'boolean', value: false, description: 'build static modules')

Add warning that OpenSSL backend isn't ready for Linux distros
Add warning that OpenSSL backend isn't ready for Linux distros

There are hacks in half the tests where this backend doesn't return the
expected error code or doesn't work as expected. But Arch Linux has
enabled it for some reason. Warn distros.

I do hope to enable this backend by default in the future. For now, it's
not there yet.
