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@JohannesBuchner for a bit more information, are you presently using Sherpa with one of the CIAO distributions or as standalone? Coincidentally, I've been looking into this the past week, and...

In your CIAO environment, please replace `$ASCDS_CONTRIB/bin/convert_xspec_user_model` with: [convert_xspec_user_model.aug31-relxill](https://github.com/sherpa/sherpa/files/9480021/convert_xspec_user_model.aug31-relxill.txt). Assuming you're using the Conda-compilers, then set: (t)csh: ``` setenv CC ${CONDA_PREFIX}/bin/x86_64-conda-linux-gnu-gcc setenv CXX ${CONDA_PREFIX}/bin/x86_64-conda-linux-gnu-g++ setenv CFLAGS "-Wno-unused-variable -Wno-array-bounds" ``` bash/zsh:...