Hi Caroline,

The error message you're seeing suggests that your cmake version (check with 
`cmake --version`) is not recent enough. You need to have at least cmake 3.18 
installed. If your operating system does not provide a newer version and you're 
using anaconda or miniforge as your python environment, you can install a newer 
version that way (with `conda install cmake`).

If you're not using an anaconda flavor, it is also possible to install cmake 
via pip with `pip install --user cmake`. You then just have to make sure that 
you call the right cmake binary when configuring ARTS. You might have to 
provide the full path to the pip cmake version, e.g. `$HOME/.local/bin/cmake ..`


> On 23 Aug 2022, at 16:17, Caroline Cox - STFC UKRI <caroline....@stfc.ac.uk> 
> wrote:
> Thanks, Patrick for your reply.
> I am using ARTS 2.2 as I am having problems getting the latest version to 
> run.  This is not ideal, I'd rather run the most recent version, but I am 
> finding an error message "[module] requires the language dialect "cxx17" , 
> but cmake does not know the compile flags to use to enable it.".  I've 
> updated all my compilers, but does not seem to fix this issue. If anyone has 
> any experience with this then do let me know.
> Anyway, version 2.2 runs for clear-sky, so until I get the later version 
> going this is fine.  I have compiled with fortran options to enable the 
> Tmatrix code, and I can use it to produce single scattering xml files.  These 
> however, do not appear to be the format needed by the test file TestDOIT, and 
> I am getting xml syntax errors reported.  
> If there are any other sources of information out there with a few more 
> detailed examples on how to use this for clouds, I would really interested to 
> see them.  
> Thanks
> Caroline

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