Can anyone help me with this?
I cannot figure out how to correctly install Rcmdr.
it seems that you lack the X11 system dependency to make this work.
you can follow advices here for Mac Installation:
I found the link consulting the url on cran page
Thank you very much. Problem solved.
can you mark your question as solved then ? It will help people know there is a solution and mark the question as solved, in the list of questions.