Hello I have recently upgraded R to the newest version. Unfortunately my old (fortran and C) R-package cannot be installed anymore (was built before R 3.0.0: please re-install it). I have tried R CMD INSTALL package_name but I noticed that R requests gcc-4.8.2 and specific locations for the libraries (gcc and gfortran). Can someone point me to the documentation on how to install gcc as R requires, please? Please note that I have used "brew install gcc" on another mac and soft linked all the necessary libraries so that gcc-4.9.1 can be used as 4.8 (as R requires). However I would like a clean installation. Many thanks Ed