Cannot compile anything with cmdstan MacOS Tahoa

Interfaces CmdStan
1

Short summary of the problem

Compiling cmdstan form Github or compiling any Stan program after installing cmdstan with miniconda results in a lot of error messages. Starting with

In file included from ../tbb_2020.3/src/tbbmalloc/backend.cpp:19:
In file included from ../tbb_2020.3/src/tbbmalloc/tbbmalloc_internal.h:21:
In file included from ../tbb_2020.3/src/tbbmalloc/TypeDefinitions.h:54:
In file included from ../tbb_2020.3/src/tbbmalloc/Customize.h:21:
In file included from ../tbb_2020.3/include/tbb/tbb_stddef.h:91:
In file included from ../tbb_2020.3/include/tbb/tbb_config.h:36:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cstddef:56:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__cstddef/byte.h:14:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__type_traits/enable_if.h:34:1: error: cannot template a using declaration
using __enable_if_t _LIBCPP_NODEBUG = typename enable_if<_Bp, _Tp>::type;
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__type_traits/enable_if.h:34:21: error: expected expression
using __enable_if_t _LIBCPP_NODEBUG = typename enable_if<_Bp, _Tp>::type;

MacOS Tahoe 26.1, cmdstanr 0.9.0, RStudio 2025.09.2, cmdstan 2.37.0. Rebuild.cmdstan() doesn’t help.

clang version 19.1.7
Target: arm64-apple-darwin25.1.0
Thread model: posix
InstalledDir: /opt/miniconda3/envs/stan/bin

GNU Make 4.4.1
Built for aarch64-apple-darwin20.0.0

2

If you’re installing from conda-forge, can you share your complete conda environment versions?

3

Hi!

Many thanks for your reply!

My Miniconda version is 25.9.1. It should be current because my older installation of Anaconda could not connect to conda-forge (HTTP 404 NOT FOUND for channel…) so I removed Anaconda and installed a new copy of Miniconda.

It seems that something is wrong with my C++ compiler even when

check_cmdstan_toolchain(fix = TRUE)
The C++ toolchain required for CmdStan is setup properly!

Best regards,

4

Hello again!

I reinstalled Xcode and now Stan seems to work. At least I can compile and run some simple models!

Sorry to bother the forum without checking everything by myself!

Best regards,