We provide R 3.3.3 built with both intel and foss toolchains and in both cases 
we observe that the bitmap type is set to "Xlib" instead of "cairo", as it 
should be since the cairo capability is TRUE. Here it is for the unbelievers:

> capabilities("png")
png
TRUE
> capabilities("cairo")
cairo
TRUE
> capabilities("X11")
X11
TRUE
> options('bitmapType')
$bitmapType
[1] "Xlib"

According to the R documentation [A] the default should be "cairo" since it is 
available.
Do you think it is a bug in R or something relative to how it has been built?

[A] https://stat.ethz.ch/R-manual/R-devel/library/grDevices/html/x11.html


--
Davide Vanzo, PhD
Application Developer
Advanced Computing Center for Research and Education (ACCRE)
Vanderbilt University - Hill Center 201
(615)-875-9137
www.accre.vanderbilt.edu

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