WARNING: unrecognized options: --disable-netaccess

Question

I am trying to install Xerces-C to my Shibboleth 2 SP following this guide: https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPLinuxSourceBuild

But when i run: ./configure --prefix=/opt/shibboleth-sp --disable-netaccessor-libcurl i get this warning: WARNING: unrecognized options: --disable-netaccessor-libcurl

[...]
config.status: creating src/xercesc/util/Xerces_autoconf_config.hpp
config.status: src/xercesc/util/Xerces_autoconf_config.hpp is unchanged
config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing libtool-rpath-patch commands
configure: WARNING: unrecognized options: --disable-netaccessor-libcurl
configure:
configure: Report:
configure:   File Manager: POSIX
configure:   Mutex Manager: POSIX
configure:   Transcoder: icu
configure:   NetAccessor: curl
configure:   Message Loader: inmemory

I tried to passing it and make and make install but does not install it and i get something like:

make[2]: Nothing to be done for `install-data-am'.
make[2]: Leaving directory `/home/user/opt/xerces-c-3.1.1/samples'
make[1]: Leaving directory `/home/user/opt/xerces-c-3.1.1/samples'
make[1]: Entering directory `/home/user/opt/xerces-c-3.1.1'
make[2]: Entering directory `/home/user/opt/xerces-c-3.1.1'
make[2]: Nothing to be done for `install-exec-am'.
test -z "/home/user/opt/shibboleth-sp/lib/pkgconfig" || /bin/mkdir -p "/home/user/opt/shibboleth-sp/lib/pkgconfig"
 /usr/bin/install -c -m 644 xerces-c.pc '/home/user/opt/shibboleth-sp/lib/pkgconfig'
make[2]: Leaving directory `/home/user/opt/xerces-c-3.1.1'
make[1]: Leaving directory `/home/user/opt/xerces-c-3.1.1'

What does that mean?
Thank you!