[MacPorts] #68512: pkg-config @0.29.2: GLib-CRITICAL **: GString *g_string_append(GString *, const gchar *): assertion 'val != NULL' failed

[MacPorts]

#68512: pkg-config @0.29.2: GLib-CRITICAL **: GString *g_string_append(GString *,
const gchar *): assertion 'val != NULL' failed
------------------------+------------------------
  Reporter:  Behinder   |      Owner:  ryandesign
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:
      Port:  pkgconfig  |
------------------------+------------------------

Comment (by Behinder):

 that gave me additional error
 `Variable 'exec_prefix' not defined in '/opt/local/lib/pkgconfig/cairo-
 script-interpreter.pc'`

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Ticket URL: <https://trac.macports.org/ticket/68512#comment:8>
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