File _constraints of Package ghc

<constraints>
  <hardware>
    <disk>
      <size unit="G">12</size>
    </disk> 
    <physicalmemory>
      <size unit="G">4</size>
    </physicalmemory>
  </hardware>
  <overwrite>
    <conditions>
      <arch>ppc64le</arch>
    </conditions>
    <hardware>
    <memory>
      <size unit="G">8</size>
    </memory>
    </hardware>
  </overwrite>
</constraints>