It hasn't worked for years and the recent upgrade to doxygen-1.8.6
did not fix it. Just deactivate the feature for now.
# The default value is: YES.
# This tag requires that the tag GENERATE_HTML is set to YES.
# The default value is: YES.
# This tag requires that the tag GENERATE_HTML is set to YES.
# When the SERVER_BASED_SEARCH tag is enabled the search engine will be
# implemented using a web server instead of a web client using Javascript. There
# When the SERVER_BASED_SEARCH tag is enabled the search engine will be
# implemented using a web server instead of a web client using Javascript. There