* installing *source* package ‘RDieHarder’ ...
** package ‘RDieHarder’ successfully unpacked and MD5 sums checked
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for gsl-config... no
configure: error: gsl-config not found, is GSL installed?
ERROR: configuration failed for package ‘RDieHarder’
* removing ‘/Builds/CRAN-QA-Simon/packages/mavericks-x86_64/results/3.1/RDieHarder.Rcheck/RDieHarder’