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Introduce configure options --disable-wifi-source, --disable-3g-source and --disable-modem-gps-source to allow disabling of backends that depend on NetworkManager and ModemManager (since these components are not widely ported). There is no "auto detect" -- the options must be explicitly specified in order to disable the feature. This prevents a quiet reduction in functionality just because the right headers didn't happen to be installed at configure time, which should help prevent packaging mistakes. https://bugs.freedesktop.org/show_bug.cgi?id=73961
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