[Rcpp-devel] Getting different build commands on Linux vs. Mac OS

Ralf Stubner ralf.stubner at r-institute.com
Mon Apr 30 15:54:52 CEST 2018

On 30.04.2018 12:48, Evan Biederstedt wrote:
> How do I direct the Makevars to use g++ and give me the "correct" build
> as I see on Linux? `CXX=g++` or `CXX=/usr/local/bin/g++` doesn't appear
> to work. 

Quoting Duncan Murdoch in

> According to section 1.2.1 "Using Makevars" in Writing R Extensions,
> R_HOME/etcR_ARCH/Makeconf is included after Makevars, so what you're
> seeing is by design. I believe this is so that packages are built with
> tools compatible with those that built R. (Remember, packages are
> designed for distribution to diverse systems.)

So you might change various flags within src/Makevars via for example
PKG_CXXFLAGS, but you cannot overwrite CXXFLAGS or CXX itself. And there
is no PKG_CXX. You can change the used compiler for *your* system via
~/.R/Makevars, though. From my point of view that is a (short-time)
workaround only. You have to figure out why clang does not like your


Ralf Stubner
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