Install R on Ubuntu with libcurl support

| The one strange thing I am now noticing is that precise does not have
| libcurl listed as a dependency. If you go to
| https://cran.r-project.org/bin/linux/ubuntu/precise/Packages and look
| for "libcurl" it is not listed. The other Ubuntu builds, such as
| trusty or wily do list it.

I run vivid. 

Dirk

http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org