Unable to install packages

[argowtham]

I am unable to install any packages after I downgraded my R version from 3.5.1 to 3.2.1 (uninstall 3.5.1 and re-install 3.2.1) on my mac. Any package that I try to install fails with the following error.

> install.packages("data.table")

  There is a binary version available but the source version is later:
           binary source needs_compilation
data.table  1.9.6 1.12.0              TRUE

Do you want to install from sources the package which needs compilation?
y/n: y
installing the source package ‘data.table’

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  3 3100 3233k  100 3233k    0     0   193k     0  3790k      0 --:--:-- --:--:-- --:--:-- 3786k
Warning in strptime(xx, f <- "%Y-%m-%d %H:%M:%OS", tz = tz) :
  unknown timezone 'zone/tz/2018i.1.0/zoneinfo/America/Chicago'
* installing *source* package ‘data.table’ ...
** package ‘data.table’ successfully unpacked and MD5 sums checked
** libs
llvm-gcc-4.2 -arch x86_64 -std=gnu99 -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG  -I/usr/local/include    -fPIC  -mtune=core2 -g -O2  -c assign.c -o assign.o
make: llvm-gcc-4.2: No such file or directory
make: *** [assign.o] Error 1
ERROR: compilation failed for package ‘data.table’
* removing ‘/Library/Frameworks/R.framework/Versions/3.2/Resources/library/data.table’
Warning in install.packages :
  installation of package ‘data.table’ had non-zero exit status

The downloaded source packages are in
	‘/private/var/folders/23/shy8fvwx0hq0s70yl16kqfd40000gn/T/Rtmp0oJdLF/downloaded_packages’

Much appreciate any help!!

[andresrcs]

There are no precompiled versions of this packages for your R version, and you are lacking the necessary libraries for compiling packages in your system (e.g llvm-gcc-4.2)

[martin.R]

R3.2.1 is very old and recent packages will generally not be compatible with this version.

Is there any reason you need to run such an old version?

[argowtham]

Our team is using this version of R on the grid. So I have to use this version for my local version as well for avoiding package compatibility issues.

[argowtham]

I made some changes to the MakeConf file as per this stackoverflow thread - https://stackoverflow.com/questions/19533220/cannot-install-r-package-from-source-in-mac-osx-maverick). It seems to be working for now.