Hi Witali, Great that it worked with GCC.
The problem with Clang is a known issue on operating systems that link by default against the GNU libstdc++. In the case of Ubuntu, compiling with clang requires explicit linking against LLVM's libc++ by setting `export CXXFLAGS=-stdlib=libc++` before calling cmake. I'm working on a pull request that updates our cmake configuration to output proper errors if the available compiler is too old and will also add the automatic switch to libc++ if clang is used. Thanks for your feedback and good luck with the line mixing! Cheers, Oliver  https://github.com/atmtools/arts/pull/526 > On 14 Sep 2022, at 17:48, witali.kroc...@unibe.ch wrote: > > I was running Ubuntu 20.04LTS which only offers gcc 9 and clang 10. Upgrading > gcc and clang on 20.04 was not possible (at least not easily). After > upgrading to 22.10 which does provide gcc 11 and clang 14 I managed to > install ARTS, but only using gcc. When trying to use clang as directed in > "LLVM/Clang compiler" section on the gitpage there was an error: > "fatal error: instantiating fold expression with 2003 arguments exceeded > expression nesting limit of 256" > > Will try to run the line mixing module know. > > Best regards > Witali
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