[MacPorts] #63837: gdal +grass emits error message outside of any phase

[MacPorts]

#63837: gdal +grass emits error message outside of any phase
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.1
 Keywords:              |       Port:  gdal
------------------------+----------------------
 gdal +grass emits an error message outside of any phase:

 https://build.macports.org/builders/jobs-
 mirror/builds/327006/steps/mirror/logs/stdio

 {{{
 --->  Fetching distfiles for gdal
 gdal +grass
 Error: The grass variant requires grass 7 to be installed.
 Error: Since grass7 depends on gdal, please first install gdal WITHOUT the
 grass variant.
 Error: Then install grass7, then reinstall gdal with the grass variant.
 }}}

 Ports must emit error messages only within a phase. Within a `pre-
 configure` block might be a good choice here.

-- 
Ticket URL: <https://trac.macports.org/ticket/63837>
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