[R-pkg-devel] gfortran: command not found

[Spencer Graves]

Hello:


	  "R CMD build KFAS" under macOS 11.7.8 stopped with:


using C compiler: ‘Apple clang version 12.0.5 (clang-1205.0.22.9)’
sh: gfortran: command not found
using SDK: ‘MacOSX11.3.sdk’
gfortran -arch x86_64  -fPIC  -Wall -g -O2  -c  approx.f90 -o approx.o
make: gfortran: No such file or directory
make: *** [approx.o] Error 1
ERROR: compilation failed for package ‘KFAS'


	  My web search suggests several different ways to fix this problem, 
but I don't know which to try.



	  Suggestions?
	  Thanks,
	  Spencer Graves


p.s.  I have both "brew" and "port" installed.  I recently used "port" 
to upgrade another software package.  A web search suggested the 
following:


sudo port install gcc48
sudo port select -set gcc mp-gcc48


	  However, this comment was posted roughly 9 years ago.  Below please 
find sessionInfo().


sessionInfo()
R version 4.3.1 (2023-06-16)
Platform: x86_64-apple-darwin20 (64-bit)
Running under: macOS Big Sur 11.7.8

Matrix products: default
BLAS: 
/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib 

LAPACK: 
/Library/Frameworks/R.framework/Versions/4.3-x86_64/Resources/lib/libRlapack.dylib; 
  LAPACK version 3.11.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: America/Chicago
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
  [1] compiler_4.3.1  R6_2.5.1        magrittr_2.0.3  cli_3.6.1
  [5] tools_4.3.1     glue_1.6.2      rstudioapi_0.14 roxygen2_7.2.3
  [9] xml2_1.3.4      vctrs_0.6.2     stringi_1.7.12  knitr_1.42
[13] xfun_0.39       stringr_1.5.0   lifecycle_1.0.3 rlang_1.1.1
[17] purrr_1.0.1