[R-SIG-Mac] Starting tcltk without Tk

[Philippe Grosjean]

Hello,

Up to R 2.6.2, I used to start Tcl *without Tk* (I need only Tcl for 
some part of my work, like a socket server written in Tcl only, for 
instance) with this code under Mac OS X (particularly on this system, 
because I don't want to start X11 just to use Tcl code, which is 
required for Tk!):

 > Sys.unsetenv("DISPLAY")
 > library(tcltk)

I got then the message "no DISPLAY variable so Tk is not available", but 
could work with Tcl without problems.

Now, with R 2.7.0, I got the following and Tcl failed to load:
Loading Tcl/Tk interface ... Error in fun(...) : no display name and no 
$DISPLAY environment variable
Error : .onLoad failed in 'loadNamespace' for 'tcltk'
Error: package/namespace load failed for 'tcltk'

I try to locate the message "no display name and no $DISPLAY environment 
variable" in the code but I cannot find it. Could someone help me please?

I understand that starting Tcl without Tk from R is not an intended 
behaviour, but would it be possible to include an option to do so?

 > sessionInfo()
R version 2.7.0 Patched (2008-04-22 r45460)
i386-apple-darwin8.10.1

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

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

Many thanks,

Philippe Grosjean
-- 
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  ) ) ) ) )
( ( ( ( (    Prof. Philippe Grosjean
  ) ) ) ) )
( ( ( ( (    Numerical Ecology of Aquatic Systems
  ) ) ) ) )   Mons-Hainaut University, Belgium
( ( ( ( (
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