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BWidget missing

Denis Chabot 
Hi,

I installed all that was available when I installed R 2.9.2, including  
tcltk. However, I got this message upon loading PBSmodelling.

I had a quick look at what Google found but it seems that I'd have to  
install this from source. Why would this particular part of tcltk need  
to be installed manually while the rest seems to be pre-installed  
(with the OS? by the R installer?).

Thanks in advance,

Denis Chabot

[R.app GUI 1.29 (5464) i386-apple-darwin8.11.1]

 > library(PBSmodelling)
Chargement de Tcl/Tk... termin?

PBS Modelling 2.21 -- Copyright (C) 2005-2009 Fisheries and Oceans  
Canada

A complete user guide 'PBSmodelling-UG.pdf' is located at
  /Library/Frameworks/R.framework/Resources/library/PBSmodelling/doc/ 
PBSmodelling-UG.pdf

Packaged on Sun
Pacific Biological Station, Nanaimo

-------------------------------------------------------------
ERROR: PBS Modelling requires the tcl package "BWidget"
and cannot proceed until it is installed.
Ubuntu (apt) users can install via the command:
	apt-get install bwidget

-------------------------------------------------------------
Warning message:
In tclRequire("BWidget") : Tcl package 'BWidget' not found
 > sessionInfo()
R version 2.9.2 (2009-08-24)
i386-apple-darwin8.11.1

locale:
fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] PBSmodelling_2.21

loaded via a namespace (and not attached):
[1] tcltk_2.9.2