Hi, I am currently trying to use the package called ChIPsim. However, it fails to be installed. > source("http://www.bioconductor.org/biocLite.R") > biocLite("ChIPsim") Using R version 2.9.2, biocinstall version 2.4.13. Installing Bioconductor version 2.4 packages: [1] "ChIPsim" Please wait... install.packages(pkgs = pkgs, repos = repos, dependencies = dependencies, ????: argument 'lib' is missing: using '/Users/kelvinfu/Library/R/2.9/library' Warning message: In getDependencies(pkgs, dependencies, available, lib) : package ?ChIPsim? is not available Besides, my computer is Mac OS. Hope to hear from you soon. Thanks very much. Best, Kelvin