I had the same problem by trying to install the mgcv package. The problem came from the Matrix package
library(Matrix) => same error as yours I have reinstalled the Matrix package, now everything work fines best chris -- View this message in context: http://r.789695.n4.nabble.com/Error-Installing-Package-with-Dependency-on-Matrix-tp4638544p4644862.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.