[MacPorts] #57039: glib2 @2.56.2: build fails due to Tiger "which" command

[MacPorts]

#57039: glib2 @2.56.2: build fails due to Tiger "which" command
---------------------------------+------------------------
  Reporter:  xstnztk             |      Owner:  ryandesign
      Type:  defect              |     Status:  accepted
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.5.3
Resolution:                      |   Keywords:  tiger
      Port:  glib2, glib2-devel  |
---------------------------------+------------------------
Changes (by xstnztk):

 * Attachment "patch-autogen.sh.diff" added.

 Patch fixing the autogen.sh script to use command -v instead of which to
 determine if a command is present.

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Ticket URL: <https://trac.macports.org/ticket/57039>
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