Question: Compile errors

[Zhuk66]

I am trying to install rstan with Microsoft R Open 4.0.2 on Red Hat Enterprise Linux 7 and getting compile errors.
Somehow Microsoft copyright message is being appended to g++ compiler options. I modified the Makevars file by adding a --quite key to Rscript options, i.e.:
PKG_CPPFLAGS += $(shell "${R_HOME}/bin/Rscript" --quiet -e "RcppParallel::CxxFlags()")
It compiled after that, but this kind of solution is not acceptable. How can I compile and
install rstan without modifying Makevars?

Output:

• installing source package ‘rstan’ ...
  ** package ‘rstan’ successfully unpacked and MD5 sums checked
  ** using staged installation
  ** libs
  g++ -I/.../4.0.2/lib64/R/include -DNDEBUG -I"../inst/include" -I"../inst/include/boost_not_in_BH" -I"."
  -DBOOST_DISABLE_ASSERTS -DBOOST_PHOENIX_NO_VARIADIC_EXPRESSION -DBOOST_NO_AUTO_PTR -D_REENTRANT -DSTAN_THREADS
  Microsoft R Open 4.0.2 The enhanced R distribution from Microsoft Microsoft packages Copyright (C)
  2020 Microsoft Corporation Using the Intel MKL for parallel mathematical computing(using 4 cores).
  Default CRAN mirror snapshot taken on . See: https://mran.microsoft.com/.
  -I'/.../4.0/2020-10-16/cran/Rcpp/include' -I'/.../4.0/2020-10-16/cran/RcppEigen/include'
  -I'/.../4.0/2020-10-16/cran/BH/include' -I'/.../4.0/2020-10-16/cran/StanHeaders/include'
  -I'/.../4.0/2020-10-16/cran/RcppParallel/include' -DU_STATIC_IMPLEMENTATION -O3 -fPIC
  -c chains.cpp -o chains.o
  /bin/bash: -c: line 0: syntax error near unexpected token `('