File _constraints of Package petsc

<?xml version="1.0" encoding="UTF-8"?>
<constraints>
  <hardware>
    <memory>
      <size unit="G">6</size>
    </memory>
  </hardware>
  <overwrite>
    <conditions>
      <arch>ppc64</arch>
      <arch>ppc64le</arch>
    </conditions>
    <hardware>
    <memory>
      <size unit="G">6</size>
    </memory>
    </hardware>
  </overwrite>
</constraints>