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[igraph] What is minimum version of R that supports igraph?

From: Bob Harris
Subject: [igraph] What is minimum version of R that supports igraph?
Date: Wed, 23 May 2018 12:51:51 -0400

Sorry to ask such a basic question.  (And I did try to find an answer in the 

(see log below) My attempt to install igraph on a machine running R 3.2.5 
failed.  I can't tell whether this was a failure of the mirror or whether 
igraph is not supported by R 3.2.5 -- at the end of the log there are two 

The answer will guide my next step.  Installing a more recent version of R is a 
possibility but I expect it to be quite a headache (and which version is right? 
the list of debian versions I found reports that every version from 3.2.5 to 
3.5.0 is either "experimental" or "unstable").  So I'd like to avoid that if at 
all possible.

Thanks for any help,

This is what I tried:

$ R --vanilla
> install.packages(c("igraph"))

Installing package into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
Warning in install.packages(c("igraph")) :
  'lib = "/usr/local/lib/R/site-library"' is not writable
Would you like to use a personal library instead?  (y/n) [y]

Would you like to create a personal library
to install packages into?  (y/n) [y]

--- Please select a CRAN mirror for use in this session ---
Error in download.file(url, destfile = f, quiet = TRUE) : 
  unsupported URL scheme
HTTPS CRAN mirror 

 1: 0-Cloud [https]                2: Austria [https]             
 ......... snip .........
19: USA (TN) [https]              20: USA (TX) [https]            
21: USA (WA) [https]              22: (HTTP mirrors)              

Selection: [19]

Warning: unable to access index for repository 
  unsupported URL scheme
Warning message:
package ‘igraph’ is not available (for R version 3.2.5) 

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