R help - Aug 2021 - Configure error: checking if libcurl supports https... no

I'm getting results from a package which differ from results that I got
a few weeks ago, and the only thing that I can think of that's changed
is the version of R (from 4.1.0 to 4.4.1).

So I wanted to install 4.1.0 and play around with that, to see if that
is indeed the explanation.  (If that is so, a whole new set of
questions would be raised, but let's leave that for the moment.)  I
downloaded the tarball and set about installing 4.1.0 from source.  But
the configure step threw an error, as given in the subject line of
this message.  The error went on:
> configure: error: libcurl >= 7.28.0 library and headers are required
> with support for https
A bit of web searching turned up the advice to re-install curl
using

    sudo apt-get install curl

but when I did that I was informed that:
> curl is already the newest version (7.68.0-1ubuntu2.6).
Has anyone got any *useful* advice?  If so, please present it
in very simple terms if you can.  (I am a Bear of Very Little Brain,
and long words bother me.)  A step-by-step recipe would be appreciated.

I'm running Ubuntu 20.04, with a Mate 1.24.0 desktop.

Grateful for any pearls of wisdom.

cheers,

Rolf Turner

P.S. The config.log file seems to be full of stuff relating to errors
from "openssl.c" but this is *way* beyond my pay grade.

R. T.

-- 
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276

Hi,
What you need is the libcurl library, not the program curl (which you 
have installed):

     sudo apt-get install libcurl4

and probably (if not installed automatically by apt):

     sudo apt-get install libcurl4-openssl-dev

Now it should work.

PS. you may always check which package provides a particular file by using:

     apt-file find libcurl

-- 
Regards,
Adam Wysoki?ski

On 8/28/21 12:18, Rolf Turner wrote:
> 
> I'm getting results from a package which differ from results that I got
> a few weeks ago, and the only thing that I can think of that's changed
> is the version of R (from 4.1.0 to 4.4.1).
> 
> So I wanted to install 4.1.0 and play around with that, to see if that
> is indeed the explanation.  (If that is so, a whole new set of
> questions would be raised, but let's leave that for the moment.)  I
> downloaded the tarball and set about installing 4.1.0 from source.  But
> the configure step threw an error, as given in the subject line of
> this message.  The error went on:
> 
>> configure: error: libcurl >= 7.28.0 library and headers are required
>> with support for https
> 
> A bit of web searching turned up the advice to re-install curl
> using
> 
>      sudo apt-get install curl
> 
> but when I did that I was informed that:
> 
>> curl is already the newest version (7.68.0-1ubuntu2.6).
> 
> Has anyone got any *useful* advice?  If so, please present it
> in very simple terms if you can.  (I am a Bear of Very Little Brain,
> and long words bother me.)  A step-by-step recipe would be appreciated.
> 
> I'm running Ubuntu 20.04, with a Mate 1.24.0 desktop.
> 
> Grateful for any pearls of wisdom.
> 
> cheers,
> 
> Rolf Turner
> 
> P.S. The config.log file seems to be full of stuff relating to errors
> from "openssl.c" but this is *way* beyond my pay grade.
> 
> R. T.
>