install package ROCR

i can not install ROCR package. The console reported that package ‘ROCR’ is not available (for R version 3.5.3). How can i solve it? thanks

WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
Installing package into ‘C:/Users/user/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)
Warning in install.packages :
package ‘ROCR’ is not available (for R version 3.5.3)

You require a later version of R:

Alternatively you could install an archived version of the package.

but now i have a new question. The console reported that
dependency 'gplots' is not available for package 'ROCR'.
How can i do to solve it?

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