Hello there!
I hope to be in the right place!
I should run some R code which calls C subroutines and for this reason I should install r-base-dev. I have SuSE 11 (patchlevel 1). I'm TOTALLY new to SuSE and to linux, but googling around I found out that I just had to run in the terminal the following code:

sudo zypper r-base-dev
But when doing that, I get the following message:

sudo zypper install r-base-dev
Retrieving repository 'SUSE:SLE-11' metadata [\]
File '/repodata/repomd.xml' not found on medium 'http://download.opensuse.org/reposit...standard/'

Abort, retry, ignore? [a/r/i/?] (a): i
Retrieving repository 'SUSE:SLE-11' metadata [error]
Repository 'SUSE:SLE-11' is invalid.
Can't provide /repodata/repomd.xml : User-requested skipping of a file
Please check if the URIs defined for this repository are pointing to a valid repository.
Warning: Disabling repository 'SUSE:SLE-11' because of the above error.
Loading repository data...
Reading installed packages...
'r-base-dev' not found.
Resolving package dependencies...

Nothing to do.
Reading other similar question, I guessed that the name of the repository has been changed, but I didn't find the right one. Could someone be so kind to help me with this? Thank you very much and sorry for bothering you!