anchor.diff:    '';
   
     cmakeFlags = [
  -    "-DCATCH_DIR=${catch}/include/catch"
  +    "-DCATCH_DIR=${catch2}/include/catch2"
       "-DINCHI_LIBRARY=${inchi}/lib/libinchi.so"
       "-DINCHI_LIBRARIES=${inchi}/lib/libinchi.so"
       "-DINCHI_INCLUDE_DIR=${inchi}/include/inchi"
  
positive.code: , fetchzip
  , cmake
  , boost
  , catch
  , inchi
  , cairo
  , eigen
  
negative.code: 
    buildInputs = [
      boost
      catch2
      inchi
      eigen
      cairo
  