'Install R package: library not found for -lgfortran

I am a Windows user. I build my own R package based on Rcpp and RcppArmadillo. I put it on my GitHub, and I install it using the codes:

devtools::install_github("RunzhiZ/asmbPLS")

I and all my friends who use Windows can install it successfully. But all the Mac users have the error message below:

ld: warning: directory not found for option '-L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin18/8.2.0'
   ld: warning: directory not found for option '-L/usr/local/gfortran/lib'
   ld: library not found for -lgfortran
   clang: error: linker command failed with exit code 1 (use -v to see invocation)
   make: *** [asmbPLS.so] Error 1
   ERROR: compilation failed for package ‘asmbPLS’

Does anyone have any ideas on this error?

Thanks a lot!!

rmacosrcppr-package


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