[ET Trac] [Einstein Toolkit] #832: ExternalLibraries/zlib gives bad error message if "patch" is not available

[Einstein Toolkit]

#832: ExternalLibraries/zlib gives bad error message if "patch" is not available
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  Reporter:  hinder                 |       Owner:             
      Type:  defect                 |      Status:  reviewed_ok
  Priority:  minor                  |   Milestone:             
 Component:  EinsteinToolkit thorn  |     Version:             
Resolution:                         |    Keywords:             
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Comment (by eschnett):

 I expect that most configuration variables are optional, and thus
 explicitly setting them to empty if they are unset would be inconvenient.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/832#comment:8>
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