I want to set -std=c++0x, using Rcpp with inline.

I saw R: C++ Optimization flag when using the inline package but don't want to make a system-wide change, so I was trying option 2 in Dirk's answer.

I tried:

settings=getPlugin("Rcpp")
settings$Makevars[length(settings$Makevars)+1] = "CXXFLAGS = $(CXXFLAGS) -std=c++0x"
fun=cxxfunction(signature(x_ ="numeric"),src,plugin="Rcpp",settings=settings,verbose=2);

But the verbose output shows it is ignoring that. I also tried with CFLAGS, and without including existing value, but no effect.

c++ r inline rcpp
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