Hmm, you seem not to be running the very latest xcode CLT, but that is a good thing, because 4.5.1 is built with 16.2 which uses clang 16 like you do. You seem to have some sort of issue with the include path. You could start by checking that you actually have the cmath include file. I have /Library/Developer/CommandLineTools/SDKs/MacOSX15.5.sdk/usr/include/c++/v1/cmath so you should have the same thing with 15.2. You might also verify that you are actually running the C++ compiler and not the C compiler. And check that you can compile a simple C++ program. -pd
On 29 Aug 2025, at 20:09 , Lee Hsiang Liow <l.h.liow at nhm.uio.no> wrote:
New to the list.
Got a new laptop, running OS 15.5 Sequoia.
R version 4.5.1 (2025-06-13) -- "Great Square Root"
Have new Xcode, new gofortran
Trying to install an R package that runs C++, have the R dependencies, the error in installation is:
** using staged installation
** libs
using C++ compiler: ?Apple clang version 16.0.0 (clang-1600.0.26.6)?
using SDK: ?MacOSX15.2.sdk?
[??. Removing some non relevant info??]
fatal error: 'cmath' file not found
37 | #include <cmath>
| ^~~~~~~
1 error generated.
Can any one advise? Thank you!
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