Makevars to build OpenMx on MacOS

Makevars

# mate ~/.R/Makevars
# The following statements are required to use the clang4 binary
CC=/usr/local/clang4/bin/clang
CXX=/usr/local/clang4/bin/clang++
CXX1X=/usr/local/clang4/bin/clang++
CXX98=/usr/local/clang4/bin/clang++
CXX11=/usr/local/clang4/bin/clang++
CXX14=/usr/local/clang4/bin/clang++
CXX17=/usr/local/clang4/bin/clang++
LDFLAGS=-L/usr/local/clang4/lib
# End clang4 inclusion statements

# Flag for us (using random (so -stdlib=libc++) and openmp)
# CXXFLAGS   = -g -O3 -Wall -pedantic -Wconversion -Wno-sign-conversion -fopenmp -stdlib=libc++
CFLAGS     = -g -O3 -fopenmp
CXXFLAGS   = -g -O3 -fopenmp -stdlib=libc++
CXX11FLAGS = -g -O3 -fopenmp -stdlib=libc++