Incompatible library version: libtk8.6.dylib requires ... when installing R package

Incompatible library version: libtk8.6.dylib requires ... when installing
R package

I'm trying to install the R package ggplot2, though the error that I am
getting seems unrelated to that specific package. I am running on Mac OSX
10.6.8. The error message is at the bottom of this message. What happened
was:
I opened up R and typed install.packages("ggplot2"). After typing this, an
X11 window opened saying that I should update to the latest version of
X11. I clicked through and updated X11. The install went through fine,
ending with a big green check mark.
Then, I thought, "let me check if R is up to date as well, as the ggplot
documentation suggests updating R before installing ggplot". So I opened
up R, and clicked "check for updates". Lo and behold! an update appeared.
I downloaded and installed the update. The install went through fine,
ending with a big green check mark.
When I opened R, I typed install.packages("ggplot2") and I got the message
below:



> install.packages("ggplot2");
--- Please select a CRAN mirror for use in this session ---
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/tcltk.so':
dlopen(/Library/Frameworks/R.framework/Versions/3.0/Resources/library/tcltk/libs/tcltk.so,
10):
Library not loaded: /usr/X11/lib/libfreetype.6.dylib
Referenced from: /usr/local/lib/libtk8.6.dylib
Reason: Incompatible library version: libtk8.6.dylib requires version
14.0.0 or later, but libfreetype.6.dylib provides version 13.0.0



Your help is greatly appreciated. Thanks.