RStudio on Mac. May 2017

gistfile1.txt

brew update
brew upgrade

brew install Caskroom/cask/xquartz
logout/login


brew tap homebrew/science
install R 3.3.3 from CPAN
brew install Caskroom/cask/rstudio


brew install gtk+
[possibly not needed]export PATH=/opt/local/bin:/opt/local/sbin:$PATH

brew install cairo

add in ~/.shrc:
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
export PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig:$PKG_CONFIG_PATH

Good sign 
`pkg-config --cflags gtk+-2.0` shows a list of folders

install binary rgtk2
install.packages("RGtk2", dependencies = T, type = 'mac.binary.mavericks')


++++
3.4.0 didn’t work (doesnt have binary)
install.packages("RGtk2", dependencies = T, type = “source” ) throws error about 
gtk.h
maybe try
http://stackoverflow.com/questions/22953206/gulp-issues-with-cario-install-command-not-found-when-trying-to-installing-canva/23988317#23988317
add export PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig

links 
https://gist.github.com/sebkopf/9405675
https://github.com/Homebrew/legacy-homebrew/issues/13546