On a vanilla Snow Leopard machine with nothing but XCode installed, I
installed R-devel and then got this when trying to load the tcltk package:

> library(tcltk)
Error : .onLoad failed in loadNamespace() for 'tcltk', details:
  call: dyn.load(file, DLLpath = DLLpath, ...)
  error: unable to load shared object
'/Library/Frameworks/R.framework/Versions/3.0/Resources/library/tcltk/libs/x86_64/tcltk.so':

dlopen(/Library/Frameworks/R.framework/Versions/3.0/Resources/library/tcltk/libs/x86_64/tcltk.so,
10): Library not loaded: /usr/local/lib/libtcl8.5.dylib
  Referenced from:
/Library/Frameworks/R.framework/Versions/3.0/Resources/library/tcltk/libs/x86_64/tcltk.so
  Reason: image not found
Error: package or namespace load failed for 'tcltk'

> sessionInfo()
R Under development (unstable) (2013-03-03 r62117)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] C

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

FWIW, there is no /usr/local directory on this machine.

Dan

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