[R] R on mac not installing packages

[londonphd]

Hi, I have not been able to use R in my macbook pro. I am getting the
following error message every time i try to install a package

* installing *source* package ‘Hmisc’ ...
** package ‘Hmisc’ successfully unpacked and MD5 sums checked
** libs
*** arch - i386
sh: make: command not found
ERROR: compilation failed for package ‘Hmisc’
* removing ‘/Users/ravshonbek/Library/R/2.15/library/Hmisc’
* installing *source* package ‘quadprog’ ...
** libs
*** arch - i386
sh: make: command not found
ERROR: compilation failed for package ‘quadprog’
* removing ‘/Users/ravshonbek/Library/R/2.15/library/quadprog’
ERROR: dependency ‘Hmisc’ is not available for package ‘its’
* removing ‘/Users/ravshonbek/Library/R/2.15/library/its’
ERROR: dependency ‘quadprog’ is not available for package ‘tseries’
* removing ‘/Users/ravshonbek/Library/R/2.15/library/tseries’

The downloaded source packages are in

‘/private/var/folders/c7/jrjv78_x6f53l3sw_w715gk00000gn/T/RtmpS4sYUx/downloaded_packages’


I look forward to your help, plsease




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