During startup - Warning messages:
1: Setting LC_CTYPE failed, using "C"
2: Setting LC_COLLATE failed, using "C"
3: Setting LC_TIME failed, using "C"
4: Setting LC_MESSAGES failed, using "C"
5: Setting LC_MONETARY failed, using "C"         # this line is not occurring in OSX 10.10.1 Yosemite but other four are.

I found an existing question but the solution does not work for me. I do this

  1. Open Terminal
  2. Write or paste in: defaults write org.R-project.R force.LANG en_US.UTF-8
  3. Close Terminal
  4. Start R

and the warning messages are still shown. I guess this works when installing R using the package from the R project page.

How to get rid of these warning messages after installation of R in OSX?

src : http://stackoverflow.com/questions/27299420/how-to-get-rid-of-warning-messages-after-installing-r