Cannot install IRkernel with install_github(): Git not installed?

Thought I would chime in here. I had the exact same problem. I came across this post...https://github.com/IRkernel/IRkernel/issues/594 where Flying Sheep simply states to install git. So went to https://git-scm.com/ and downloaded and installed, then ran the instructions https://irkernel.github.io/installation/ and everything worked. Now using R in Jupyter Nb.

Here a way to overcome this problem. I have installed IRkernel with anaconda in my mac (I guess is the same on Linux and Windows) I typed:

conda install -c r r-irkernel

Then I started started R from terminal by typing:

R

Finally, I have install the kernelspec to tell Jupyter about IRkernel, with the option user=FALSE for installation in the global environment:

IRkernel::installspec(user=FALSE)

Hope it helps!

I had the same problem on Windows 7 and found older versions of devtools package work out. I downloaded devtools_1.13.4.tar.gz（didn't test others） from https://cran.r-project.org/src/contrib/Archive/devtools/，and did as follows:

1. install devtools_1.13.4.tar.gz from local:

   go into R, click on Packages (at the top of the R console), then click on "Install package(s) from local zip files" and install the devtools_1.13.4.tar.gz, an ERROR message shows which dependencies are in need, for me, the message was :

   ERROR: dependencies 'httr', 'memoise', 'whisker', 'digest', 'rstudioapi', 'jsonlite', 'git2r', 'withr' are not available for package 'devtools'.

2. install these dependecies:

   install.packages(c('httr', 'memoise', 'whisker', 'digest', 'rstudioapi', 'jsonlite', 'git2r', 'withr'))
   

3. reinstall devtools_1.13.4.tar.gz from local;

4. execute:

   library('devtools')
   install_github('IRkernel/IRkernel')
   IRkernel::installspec()
   

If message shows up like:

Error in IRkernel::installspec():jupyter-client has to be installed but “jupyter kernelspec --version” exited with code 127.

run R.exe from within Anaconda prompt,and execute:

IRkernel::installspec()  

and everything worked.