anchor.diff:      pcre
       zlib
       zstd
  +    lapack
       libxml2
       llvm_9
       lz4
       xz
       gsl
  +    openblas
       xxHash
       libAfterImage
       giflib
  
positive.code: , llvm_9
  , lz4
  , xz
  , pcre
  , nlohmann_json
  , pkg-config
  
negative.code: , gl2ps
  , glew
  , gsl
  , lapack
  , libX11
  , libXpm
  , libXft
  