[R-SIG-Mac] install.packages on '.tar.gz' fails

[Michael Donohue]

After updating to R 2.15.1 on OS X 10.8, I am seeing:

> install.packages("nlme_3.1-104.tar.gz", repos = NULL)
Error: file ‘nlme_3.1-104.tar.gz’ is not an OS X binary package

R CMD INSTALL is working fine, but I'm curious if anyone is having the same issue.

Thanks,

Mike