Hello All, While trying to install Matrix package following error message came out: /usr/bin/ld: cannot find -lblas-3 collect2: ld returned 1 exit status make: *** [Matrix.so] Error 1 ERROR: compilation failed for package 'Matrix' ** Removing '/usr/lib/R/library/Matrix' ** Restoring previous '/usr/lib/R/library/Matrix' It seems that someting is missing. Have anybody idea where we can find this missing piece? We have Debian Linux. Jari Haukka