[MacPorts] #58538: diff-pdf @0.3: rebuild fails in configure

[MacPorts]

#58538: diff-pdf @0.3: rebuild fails in configure
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  Reporter:  dbevans                 |      Owner:  pietvo
      Type:  defect                  |     Status:  assigned
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:
      Port:  diff-pdf wxWidgets-3.0  |
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Comment (by pietvo):

 I did a 'port selfupdate; port upgrade outdated' some days ago. It
 upgraded popper from 0.76.1_0 to 0.77.0_0 and then discovered that diff-
 pdf had to be rebuilt. And that succeeded without problems. This is on
 MacOS 10.13.6.
 But I do have /opt/local/bin/ggrep. Apparently I have requested it, and
 also it is a dependency of p5.26-config-autoconf, which isn't necessary
 anymore in my installation, but which I have requested also (apparently).
 So if I do some cleanup in this area it could easily break diff-pdf in my
 installation too.

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Ticket URL: <https://trac.macports.org/ticket/58538#comment:6>
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