wikilist file cannot be written when creating a new wiki

[ecastillac@…]

This is an example of an ikiwiki wiki creation:

imac:~ ecastilla$ ikiwiki --setup /opt/local/etc/ikiwiki/auto.setup
¿ Qué nombre tendrá el wiki ? miwiki1
¿ Qué sistema de control de versiones empleará ? svn
Which user (wiki account or openid) will be admin? ecastilla


Setting up miwiki1 ...
Importing /Users/ecastilla/miwiki1 into svn

Committed revision 1.
Checked out revision 1.
property 'svn:ignore' set on '.'
svn: warning: '*' not found
Sending        .

Committed revision 2.
Directory /Users/ecastilla/miwiki1 is now a checkout of svn repository /Users/ecastilla/miwiki1.svn
Traceback (most recent call last):
  File "/opt/local/lib/ikiwiki/plugins/rst", line 39, in <module>
    from docutils.core import publish_parts;
ImportError: No module named docutils.core
Failed to load highlight. Configuring anyway.


Creating wiki admin ecastilla ...
Choose a password: 
Confirm password: 


''ikiwiki-update-wikilist: cannot write to /opt/local/etc/ikiwiki/wikilist
** Failed to add you to the system wikilist file.
** (Probably ikiwiki-update-wikilist is not SUID root.)
** Your wiki will not be automatically updated when ikiwiki is upgraded.''


Successfully set up miwiki1:
	url:         http://imac.local/~ecastilla/miwiki1
	srcdir:      ~/miwiki1
	destdir:     ~/public_html/miwiki1
	repository:  ~/miwiki1.svn
To modify settings, edit ~/miwiki1.setup and then run:
	ikiwiki -setup ~/miwiki1.setup

If executed with

$ sudo ikiwiki --setup ...

wikilist file will be written, but root username will be inserted.