title: WARNING: unrecognized options: --disable-netaccessor-libcurl
body: <p>I am trying to install Xerces-C to my Shibboleth 2 SP following this guide:
  <a href="https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPLinuxSourceBuild" rel="nofollow">https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPLinuxSourceBuild</a></p>
  
  <p>But when i run: <code>./configure --prefix=/opt/shibboleth-sp --disable-netaccessor-libcurl</code>
  i get this warning:  <code>WARNING: unrecognized options: --disable-netaccessor-libcurl</code></p>
  
  <pre><code>[...]
  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
  </code></pre>
  
  <p>I tried to passing it and <code>make</code> and <code>make install</code> but does not install it and i get something like:</p>
  
  <pre><code>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'
  </code></pre>
  
  <p>What does that mean?<br>
  Thank you!</p>