I opened an issue in the GitHub repository but am opening this ticket here as suggested by Roland Haas. The GitHub issue description is below

In the case `ADIOS2_ENABLE_SST == yes`, after this line

```bash
ADIOS2_REQ_LIBRARIES="adios2_cxx11 adios2_c adios2_core adios2_evpath adios2_atl adios2_enet adios2_ffs adios2_dill"
```

(maybe with a fortran one too depending on that config option). Then later on, all of these libraries are appended by `_mpi` so the full library list looks something like

```
ADIOS2_LIBS="adios2_cxx11_mpi adios2_c_mpi adios2_core_mpi adios2_evpath_mpi adios2_atl_mpi adios2_enet_mpi adios2_ffs_mpi adios2_dill_mpi adios2_cxx11 adios2_c adios2_core adios2_evpath adios2_atl adios2_enet adios2_ffs adios2_dill"
```

Unfortunately, looking at my Spack build of ADIOS2, I only have the following in the `lib64` directory (actually it's the same as the one built by Cactus using the `build.sh` script):

```
cmake libadios2_c.a libadios2_core.a libadios2_cxx11.a libadios2_dill.a libadios2_evpath.a libadios2_atl.a libadios2_c_mpi.a libadios2_core_mpi.a libadios2_cxx11_mpi.a libadios2_enet.a libadios2_ffs.a
```

I think only `adios2_cxx11 adios2_c adios2_core` (and `adios2_fortran` if enabled) should be appended by `_mpi`.

Note that it seems to be correct in the case ADIOS2 is built rather than using an external library (see