The rLandsat8 package is built using maven.
From a terminal:
cd
git clone git@github.com:Terradue/rLandsat8.git
cd rLandsat8
mvn compile
That generates a compressed archive with the rLandsat8 package in:
~/rLandsat8/target/R/src/rLandsat8_x.y.z.tar.gz
To install the package, start an R session and run:
install.packages("~/rLandsat8/target/R/src/rLandsat8_x.y.z.tar.gz", repos=NULL, type="source")
Note x.y.z is the development version number.
Then load the library:
library(rLandsat8)