[R-SIG-Mac] The libpng12.0.dylib hoo-hah.

[Rolf Turner]

I just upgraded to R version 2.11.0 (to try to solve a problem with
install.packages).  That problem was duly solved, but a new problem
was introduced --- X11 no longer works with R.

I am aware of a substantial discourse on this issue, on this mailing
list.  As far as I can make out --- a lot of the discourse leaves me
bewildered --- the issue boils down to my machine having an out-of-date
version of libpng12.0.dylib.  This is in fact what the error message
tells me when I try to start X11().

My reading of the discourse appears to me to indicate that I should
be able to remedy the problem by running System Update.  I found the
menu item for that and clicked on it.  I got a pop-up window listing
the software for which updates are available.  None seems to have
anything to do with X11 or with libpng12.0.dylib.  I have attached
a screen shot of this pop-up window in pdf format.

One item that I guess might have some impact is for the whole operating
system!  The item says that Mac OS X 10.6.3 is available.  (I'm currently
running 10.6.2.)  I hesitate to try this, since I'm not sure what other
difficulties would result from so doing.  And I'm not sure how long it
would take.  Hours?  And doesn't one have to ***pay*** for OS updates?

So can anyone suggest how I might get the appropriate up-to-date version
of libpng12.0.dylib in place on my system?

When I do ls -l /usr/X11/lib/libpng12*dylib (as was
suggested in the postings on this issue) the results are:

> lrwxr-xr-x  1 root  wheel      16 28 Jan 15:07 /usr/X11/lib/libpng12.0.35.0.dylib@ -> libpng12.0.dylib
> -rwxr-xr-x  1 root  wheel  436848  6 Jul  2009 /usr/X11/lib/libpng12.0.dylib*
> lrwxr-xr-x  1 root  wheel      16 28 Jan 15:07 /usr/X11/lib/libpng12.dylib@ -> libpng12.0.dylib

Thanks for any solace and advice.

	cheers,

		Rolf Turner

P.S.:

> > sessionInfo()
> R version 2.11.0 (2010-04-22) 
> x86_64-apple-darwin9.8.0 
> 
> locale:
> [1] en_NZ.UTF-8/en_NZ.UTF-8/C/C/en_NZ.UTF-8/en_NZ.UTF-8
> 
> attached base packages:
> [1] datasets  utils     stats     graphics  grDevices methods   base     
> 
> other attached packages:
> [1] misc_0.0-12    fortunes_1.3-7 MASS_7.3-5    
> 


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