[R] Install BMR package - Mac

[Beatrice Monti]

Hi all,
I am having problems installing the BMR package.

I have been trying the following: 

	install.packages("devtools”) 
	library(devtools) 
	install_github("kthohr/BMR")

This is the error I get:

	clang: error: unsupported option ‘-fopenmp'

I have dowloaded and installed both gfortran and clang-6.0.0 from   https://cran.r-project.org/bin/macosx/tools/ <https://cran.r-project.org/bin/macosx/tools/>   but I still get the same error.
I am using R version 3.5.1 on Mac OS X.

Any suggestion to solve this problem - which steps am I missing? 
ps: my apologies if I missed important information - let me know if further details are needed to explain the problem!

Thank you so much for your help!
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