[CentOS] Is this a bug in CentOS-7 BackupPC?

When I try to start BackupPC with "sudo systemctl restart backuppc"
on my CentOS-7 server (running kernel 3.10.0-229.14.1.el7.x86_64)
I get the following error in /var/log/BackupPC/LOG

  2015-09-26 13:58:14 Reading hosts file
  2015-09-26 13:58:14 unix bind() failed: No such file or directory

This message occurs in the Perl script /usr/share/BackupPC/bin/BackupPC :

      my $sockFile = "/var/run/BackupPC/BackupPC.sock";
      unlink($sockFile);
      if ( !bind(SERVER_UNIX, sockaddr_un($sockFile)) ) {
            print(LOG $bpc->timeStamp, "unix bind() failed: $!\n");
            exit(1);
        }

As far as I can see (I'm no guru) this is trying to open a unix socket 
with the name /var/run/BackupPC/BackupPC.sock .

There is no directory /var/run/BackupPC/ on my server.
When I create this, setting backuppc.apache as owner,
and run "sudo systemctl restart backuppc"
I see in /var/log/BackupPC/LOG that BackupPC has (at long last) started

-- 
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin