How to install and load Ruby packages in R

I'm trying to use Ruby's google-finance API ( within an RMarkdown file. However, I keep getting this error when I try to run the ruby code chunk in my Rmd file

C:/Users/user/AppData/Local/Temp/RtmpyAzBuv/chunk-code-16d06afb7ac2.txt:4:in `<main>': undefined local variable or method `google' for main:Object (NameError)

Does anyone know how to successfully load a Ruby package within an RMarkdown file in order to run Ruby commands? Here is my Rmd file

title: "Untitled"
output: pdf_document

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)

# Install API
gem install google-finance-ruby-client

# Pull Microsoft stock price

prices = GoogleFinance::History.get('MSFT', start_date: Date.parse('2016-01-03'), end_date: Date.parse('2016-01-10'))


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