My own examination of R-3.3.1 configure script is that configure will
fail if libcurl 7.28+ is not present or present with ssl disabled
[m4/R.m4 line 4215 thereafter].
Unless the code for `install.package` has significantly changed between
3.2.x and 3.3.x it is an unnecessary failure dictated by an unwillingness
to have to support the alternatives. i.e.. not needing to explain what to
do in when libcurl is not present or without ssl support.
I doubt that 
install.package(“$some_package”,method=“$somemethod”)
where $somemethod is CURL (command line) or WGET has disappeared.
The R-3.2.1 package for RH7.1/centos7.1 is not compiled against libcurl
or lack https support for example. An interesting experience I had at work 
today with a user.

François
 
> On 27/10/2016, at 22:49, Jean-Pierre Flori <jpfl...@gmail.com> wrote:
> 
> 
> 
> On Thursday, October 27, 2016 at 11:41:20 AM UTC+2, Jeroen Demeyer wrote:
> On 2016-10-27 11:29, Francois Bissey wrote: 
> > R package system include downloading facility from repositories. 
> 
> That's fine but it should be possible to just run R without it's 
> packaging system. 
> Then I suggest a new solution:
> [666] :
> * patch R if curl (with https support) is not there and make curl an optional 
> package,
> * not patch R if curl (with https support) is ther.
> 
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