apache2 won't start

After following the directions in several places, (including here: 
http://darwinports.opendarwin.org/getdp/ ) using, variously (after 
throwing away  /opt after each attempt, and reinstalling darwinports 
cleanly each time)

sudo port install apache2 ;  sudo port install apache2 +mysql4 +php5 ; 
sudo port install apache2 +mysql5 +php5

apache seems to install each time fine with dependencies, but when I try 
to start it:

boswell:~ admin$ sudo /opt/local/apache2/bin/apachectl -k start

I get the following error message:

httpd: apr_sockaddr_info_get() failed for boswell

I haven't been able to find anything that addresses this. Any ideas?  
Thanks!

(Using 10.4.4; WebSharing turned off from the beginning;)