You need to have localhost configured on your computer in order to use Pd of any kind.  If you go to the Terminal, and type "ifconfig" and hit enter, you should see something like this:
hans@dhcp-10 extra $ ifconfig 
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
	inet 127.0.0.1 netmask 0xff000000 
	inet6 ::1 prefixlen 128 
On Oct 25, 2011, at 6:02 PM, Arda Eden wrote:
With Pd-0.42.5-extended-macosx106-x86_64.dmg the actual error message is :
localhost not found (inet protocol not installed ?)
On Wed, Oct 26, 2011 at 12:56 AM, Arda Eden 
<ardaeden@gmail.com> wrote: 
Both x86 and x86_64 versions are saying :ERROR: failed to allocate port, exiting !
 On Wed, Oct 26, 2011 at 12:31 AM, Hans-Christoph Steiner 
<hans@at.or.at> wrote: 
 That's an odd one.  Which version of Pd-extended are you using?  Have you tried a nightly build?
 
 http://autobuild.puredata.info/auto-build/latest/
 
 .hc
 
 On Oct 25, 2011, at 5:17 PM, Arda Eden wrote:
 
 
 Today I encountered a problem with Pd-extended on Osx Lion today.
 
 Application not responding. When I run it from terminal I get "inet protocol not installed ?" message.
 Everything was fine with it when I last ran it. And no docs on the net.
 Any idea ?
 Thanks.
 
 -- 
 Arda EDEN
 Inonu University
 Faculty of Fine Arts and Design
 Department of Music Technology
 Malatya/TURKEY
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-- 
Arda EDEN
Inonu University
Faculty of Fine Arts and Design
Department of Music Technology
Malatya/TURKEY 
   
-- 
Arda EDEN
Inonu University
Faculty of Fine Arts and Design
Department of Music Technology
Malatya/TURKEY