clang: error: unsupported option '-fopenmp'

[Steve-Koller]

Hi, I'm trying to install the latest version of fixest on Mac (aiming to run feols with an instrumental variable). I keep running into the below error message during install, and have spent 2+ hours trying command line approaches from threads on StackExchange without success. By any chance do you have any suggestions for how to overcome this error and install 0.10.1? If I find a solution in the meantime I will post in another comment below. Thank you!

devtools::install_github("lrberge/fixest")
Downloading GitHub repo lrberge/fixest@HEAD
✓  checking for file ‘/private/var/folders/1m/11lx175j7_953x41kstp2s9w0000gn/T/Rtmp6YLVJw/remotes37964e5bfe38/lrberge-fixest-6b478ea/DESCRIPTION’ (347ms)
─  preparing ‘fixest’: (640ms)
✓  checking DESCRIPTION meta-information
─  cleaning src
─  checking for LF line-endings in source and make files and shell scripts
─  checking for empty or unneeded directories
─  looking to see if a ‘data/datalist’ file should be added
─  building ‘fixest_0.10.2.tar.gz’
   
Installing package into ‘/Users/stevenkoller/Library/R/3.5/library’
(as ‘lib’ is unspecified)
* installing *source* package ‘fixest’ ...
** libs
clang++ -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I"/Users/stevenkoller/Library/R/3.5/library/Rcpp/include" -I/usr/local/include  -fopenmp -DSTRICT_R_HEADERS -fPIC  -Wall -g -O2 -c RcppExports.cpp -o RcppExports.o
clang: error: unsupported option '-fopenmp'
make: *** [RcppExports.o] Error 1
ERROR: compilation failed for package ‘fixest’
* removing ‘/Users/stevenkoller/Library/R/3.5/library/fixest’
* restoring previous ‘/Users/stevenkoller/Library/R/3.5/library/fixest’
Warning message:
In i.p(...) :
  installation of package ‘/var/folders/1m/11lx175j7_953x41kstp2s9w0000gn/T//Rtmp6YLVJw/file379630058d78/fixest_0.10.2.tar.gz’ had non-zero exit status

[lrberge]

Hi Steve, I have no clue about Mac...
Have you looked at #63?
Oh, maybe you could upgrade R too and see if it works?

[Steve-Koller]

Thank you, I'd previously followed some of the advice from #63, and just updated to R 4.1.2 and now it works! Not sure whether it was the R update alone or this coupled with command line changes from #63, but either way it's working now. Thank you again! Closing out.