anchor.diff:          name = "pysisrc";
         };
   
  -  binSearchPath = with lib; makeSearchPath "bin" ([
  -    jmol
  -    multiwfn
  -    xtb
  -    openmolcas
  -    pyscf
  -    psi4
  -    wfoverlap
  -    nwchem
  -  ] ++ lists.optional (orca != null) orca
  +  binSearchPath = with lib; makeSearchPath "bin" ([ ]
  +    ++ lists.optional (jmol != null) jmol
  +    ++ lists.optional (multiwfn != null) multiwfn
  +    ++ lists.optional (xtb != null) xtb
  +    ++ lists.optional (openmolcas != null) openmolcas
  +    ++ lists.optional (pyscf != null) pyscf
  +    ++ lists.optional (psi4 != null) psi4
  +    ++ lists.optional (wfoverlap != null) wfoverlap
  +    ++ lists.optional (nwchem != null) nwchem
  +    ++ lists.optional (orca != null) orca
       ++ lists.optional (turbomole != null) turbomole
       ++ lists.optional (gaussian != null) gaussian
       ++ lists.optional (cfour != null) cfour
  
positive.code:       export PYSISRC=${pysisrc}
        export PATH=$PATH:${binSearchPath}
        export OMPI_MCA_rmaps_base_oversubscribe=1
  
        echo $PYSISRC
  
        ${if fullTest
            then "pytest -v tests --disable-warnings"
            else "pytest -v --pyargs pysisyphus.tests --disable-warnings"
        }
      '';
  
      postInstall = ''
        mkdir -p $out/share/pysisyphus
        cp ${pysisrc} $out/share/pysisyphus/pysisrc
        for exe in $out/bin/*; do
  
negative.code:       scikitlearn
        qcengine
        ase
        openbabel-bindings
        pytest  # Also required for normal execution
        openssh
      ] # Syscalls
        ++ lists.optional (xtb-python != null) xtb-python
        ++ lists.optional (jmol != null) jmol
        ++ lists.optional (multiwfn != null) multiwfn
        ++ lists.optional (xtb != null) xtb
        ++ lists.optional (openmolcas != null) openmolcas
        ++ lists.optional (pyscf != null) pyscf
        ++ lists.optional (psi4 != null) psi4
        ++ lists.optional (wfoverlap != null) wfoverlap
        ++ lists.optional (nwchem != null) nwchem
        ++ lists.optional (orca != null) orca
        ++ lists.optional (turbomole != null) turbomole
        ++ lists.optional (gaussian != null) gaussian
        ++ lists.optional (cfour != null) cfour
  