I am trying to install RGtk2. I have installed GTK+ and XQuartz with Homebrew:
$ brew cask install xquartz Warning: A Cask for xquartz is already installed. Add the "--force" option to force re-install. $ brew install gtk Warning: gtk+-2.24.28_2 already installed
But when I try installing it I get the error
Rgtk.c:7:10: fatal error: 'gdk/gdkx.h' file not found
Have I missed installing some necessary package?