Hello my beloved mentors , friends.
i have operations research problems that will be solved using goal programming techniques. I'm trying to install goalprog package but couldn't do that.
install.packages("goalprog",dependencies = TRUE)
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/hady.shaaban/Documents/R/win-library/3.6’
(as ‘lib’ is unspecified)
Warning in install.packages :
package ‘goalprog’ is not available (for R version 3.6.1)
> library(goalprog)
Error in library(goalprog) : ‘goalprog’ is not a valid installed package
How can i install this package ?
thanks in advance