Thanks Martin. This is illuminating.
On 03/11/15 12:30, Morgan, Martin wrote:
The first error, about 'unsupported scheme' is saying that you (your
R) does not have SSL support (as you tracked down, the problem is
trying to read the online repositories using https://, and the
'unsupported scheme' is https). The code then goes on and uses the
snapshot of mirrors available at the time your R was installed by
reading a local file.
Your R may be using the 'internal' method (which does not support
https) or a libcurl without SSL support. I have
# ok, using libcurl
libcurl TRUE
That seems to be the crux of the matter. When I do
capabilities()["libcurl"]
I get
libcurl
FALSE
and my libcurl supports SSL
$ curl-config --features SSL IPv6 libz AsynchDNS IDN NTLM NTLM_WB
TLS-SRP
It would seem that I have libcurl on my system. When I do
$ curl-config --features
I get the same results that you show *except* for "TLS-SRP".
(Does the latter matter?)
I got SSL capability through the package
$ dpkg --get-selections |grep libcurl4 libcurl4-openssl-dev:amd64
install
Your R might have been compiled without libcurl (depending on how
you installed R and the libraries present at installation time), or
with a libcurl that does not have SSL.
Well, I would seem to have installed R without libcurl capabilities.
So how *do* I get libcurl capabilities?
I would have thought something like
./configure --with-libcurl
would be called for, but doing ./configure --help produced nothing that
involved "curl" at all.
Can you enlighten me? Ta.
In the mean time, you can
quieten things (and live insecurely) with options(useHTTPS=FALSE).
There is some discussion in ?download.file for the `method`
argument.
As I have previously said, there are no real problems at the moment ---
*except* for the fact that I am "living insecurely". I don't like that,
and would prefer to do something about it.
cheers,
Rolf
--
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
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