Hello
In the past I had not problem to link a R distribution (already installed on my mac) to Mathematica (now 10.3.1.0) using RLink. However, after upgrading R to MRO 3.2.4, the InstallR no longer works.
The commands I have used are
 
Needs["RLink`"]
SetEnvironment[
  "DYLD_LIBRARY_PATH" -> 
   "/Library/Frameworks/R.framework/Resources/lib"];
InstallR["RHomeLocation" -> 
   "/Library/Frameworks/R.framework/Resources", 
  "RVersion" -> "3.2.4"];
The error msg is InstallR::fail: Failed to install R. The following error was encountered: Unable to load dynamic libraries >>
Any suggestions?
Many thanks
Ed