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I'm trying to install a package in RStudio from Github (this package called FEct) and getting errors related to the XCode Command Line tools.

The errors:

/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:321:9: error: no member named 'isnan' in the global namespace

and errors like this for other cmath functions, in addition to

/Library/Frameworks/R.framework/Versions/4.0/Resources/library/RcppArmadillo/include/armadillo_bits/arma_cmath.hpp:42:15: error: expected unqualified-id

and several very similar errors.

Things I've tried: When I run xcrun --show-sdk-path I get

/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk

When I run clang++ -v I get

clang version 4.0.1 (tags/RELEASE_401/final)
Target: x86_64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Users/MyName/opt/anaconda3/bin

I am trying to install from the RStudio editor (downloaded from the official R website, rather than the one installed by Anaconda Navigator). I recently updated my Mac to OSX Big Sur, version 11.2.

Achintya Agarwal
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    First of all welcome to this community! it seems for me that an depency of your package is not installed correctly which might be cmath. [here](https://superuser.com/questions/1555092/cmath-compilation-errors-with-clang-10-on-mac-os-catalina) a maybe similar problem is stated – Prometheus Feb 08 '21 at 21:49
  • Thanks for the welcome. I just tried that approach (edit cmath file to #include a specific path to math.h, instead of just #include and unfortunately it doesn't work. I still get the same errors. – Achintya Agarwal Feb 08 '21 at 23:16
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    Unfortunately the macOS Big Sur update caused a number of issues compiling code; see https://stackoverflow.com/a/65334247/12957340 for a potential solution – jared_mamrot Feb 08 '21 at 23:30

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