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You've installed mod_auth_external, an Apache authentication
module enabling the use of external mechanisms for user
authentication.

Edit your apache.conf or httpd.conf to enable and setup this
module. Have a look at the files in
${PREFIX}/share/doc/mod_auth_external for information on how
to configure it, example authentication programs, etc.

Then do this to make it work effective:

# apachectl configtest (see if there are any config errors)
# apachectl restart

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