I found that for:
is unable to connect to https://r.research.att.com/el-capitan/R-devel/R-devel-el-capitan-signed.pkg (because the file does not exist, only R-devel-el-capitan.pkg).
Is it possible to fix it somehow?
I recommend you only test r-devel in linux, and use r-release or r-oldrel on macos. CRAN doesn’t publish OSX binary packages for r-devel: https://cran.r-project.org/bin/macosx/el-capitan/contrib/r-devel/
However, previous builds using r-devel on osx where working (e.g. here two months ago) when downloading R-devel-el-capitan-signed.pkg from research att. Now at https://r.research.att.com/el-capitan/R-devel/ there exists a file called R-devel-el-capitan.pkg. Could this be just an issue of a name change?
I mean, if we should not test r-devel on OSX, I would have expected that previous builds also failed.
R-devel constantly changes and may break any day. That’s why it’s called devel. It seems indeed broken now due to the changed filename.