Quantstrat RStudio R Mac

Question

I am trying to install the package Quantstrat on a Mac.
I searched for help in internet but I did not find a solution.
I already tried:

require(devtools)
install_github("braverock/quantstrat")

The error message I get is: Downloading GitHub repo braverock/quantstrat@master from URL https://api.github.com/repos/braverock/quantstrat/zipball/master Installation failed: Could not find build tools necessary to build quantstrat

Answer 1

I solved the issue.

I just needed to open "Xcode" in the Macbook and accept the new terms and conditions. Then I tried again and I was able to download and install Quantstrat.