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