How can I set CG_CONTEXT_SHOW_BACKTRACE environmental variable in R? -

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when execute following code on r:

plot(x,fx(x),type="l",main="probability density function of  x~uniform(-1,1)",xlab="x",ylab="f(x) (pdf of x)")

i following red-warning message on screen, although plot showing:

text_show_backtrace environmental variable. ktrace, please set      cg_context_show_backtrace environmental variable.

how can set cg_context_show_backtrace environmental variable on r? have seen several questions here applies xcode, there seem no similar question r.

thank you,


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