We have a user reporting trouble with geojsonio https://github.com/ropensci/geojsonio/issues/55
Boils down to not being able to get V8 installed. If you are running Windows XP or have access to one, can you try installing geojsonio and/or V8 http://cran.rstudio.com/web/packages/V8/
If you’ve successfully installed V8 on Windows XP, how did you do it?
Thanks! 
Kudos for supporting XP… but perhaps as a public service you could suggest that anyone using XP for cost reasons might upgrade to Linux OS. If doing it for compatibility … There is PCLinuxOS [1]
In any case, Microsoft has your back - they support developers who support XP even if they don’t support XP. You can download XP virtual machines from Microsoft [2] and there is XP Mode for windows 7 [3].
[1] http://www.pclinuxos.com/about/
[2] http://dev.modern.ie/tools/vms/#downloads
[3] http://www.microsoft.com/en-us/download/details.aspx?id=370
@dlebauer Nice, thanks for the links. I was hoping to test on XP but didn’t know how to get access to a download.
That is a good suggestion to move to Linux - there is a learning curve though I suppose that I can’t assume everyone wants to deal with 
Tried for a bit, too hard, maybe i’ll try again some other day. :kicking can down the road:
How many XP users are still out there. I know we (US EPA) were among the last hold outs. Machines across the agency are getting replaced so that won’t be the case for too much longer.
Given the difficulties I wonder if it is worth it?
There is a possible solution, but I haven’t tested it myself yet https://github.com/jeroenooms/V8/issues/12#issuecomment-106123210
Can you test @jhollist
Maybe. I’ve been “refreshed.” Meaning I have new hardware with Win 7 on it but looks like I could try the “XP” mode. Not sure when I’d have time to give it a try. I’ll let you know if I can do it in the next week or so.
Okay, thanks jeff! No rush. I haven’t found time either, so there’s that.