Homebrew doctor warnings requesting library deletions
I got the same warnings, and worked it around with the following:
So first back up these files:
mv /usr/local/lib/libtcl8.6.dylib /usr/local/lib/libtcl8.6.dylib.bak
...
Then install tcl/tk with Homebrew:
brew tap homebrew/dupes
brew install tcl-tk --with-tk
Then link the files, so that R can find the tcl/tk installed by Homebrew:
ln -s /usr/local/Cellar/tcl-tk/8.6.1/lib/libtcl8.6.dylib /usr/local/lib/libtcl8.6.dylib
ln -s /usr/local/Cellar/tcl-tk/8.6.1/lib/libtk8.6.dylib /usr/local/lib/libtk8.6.dylib
Please double check that the linked location is where tcl-tk is installed.
Now both Homebrew and R are happy.
More details can be found on my blog. Hope this helps.