I have to install an R package in my linux workstation (Debian 11, kernel 5.10.0-33-amd64) using particular compilation flags but I am in trouble. From root:

R CMD INSTALL --configure-args="CXXFLAGS=-lrt" /path/to/my/package.tar.gz 

but in the compilation result I see that the flags are ignored and the package failed to install.

How can I install this package?