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[Aapo Rantalainen <1576977@xxxxxxxxxxxxxxxxxx>]

I tested with upstream source of gimp-2.8.18.tar.bz2 [https://download.gimp.org/mirror/pub/gimp/v2.8/].
It is specifically compiled against gegl-0.2. 

Ubuntu 16.04 has gegl-0.3 (and not gegl-0.2). Debian and Ubuntu both use bump_Babl-GEGL_versions.patch:
-PKG_CHECK_MODULES(GEGL, gegl-0.2 >= gegl_required_version)
+PKG_CHECK_MODULES(GEGL, gegl-0.3 >= gegl_required_version)

I made this modification and compiled upstream gimp-2.8.18.tar.bz2. And
encountered same startup warnings.

---
I installed gegl-0.2 (runtime+devel) from Ubuntu-14.04 (It needs also these old packages: libopenexr6 libilmbase6 libumfpack5.6.2 libamd2.3.1 libcholmod2.1.2 libcamd2.3.1 libccolamd2.8.0 libcolamd2.8.0). Then I compiled Ubuntu-16.04's version of gimp, gimp-2.8.16-1ubuntu1 against gegl-0.2 (dropping gegl-part of bump_Babl-GEGL_versions.patch and tuning debian/control).

Now this gimp does NOT have these warnings. So the base reason for these
gegl-warnings seems to be too new gegl. (Or some of those other
dependency libraries).

---

bump_Babl-GEGL_versions.patch seems to relate this debian bugreport:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=790421 (migrating from
gegl-0.2 to gegl-0.3).


** Bug watch added: Debian Bug tracker #790421
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=790421

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https://bugs.launchpad.net/bugs/1576977

Title:
  Lots of GEGL-gegl-operation.c-WARNING on starting gimp

Status in gimp package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 16.04
  gimp: 2.8.16-1ubuntu1

  rm ~/.gimp-2.8/
  LANG=en gimp

  
  (gimp:413): GLib-GObject-WARNING **: g_object_set_valist: object class 'GeglConfig' has no property named 'cache-size'

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A3410 from "gimp:point-layer-mode" to "gimp
  :dissolve-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A39B0 from "gimp:point-layer-mode" to "gimp
  :behind-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A4090 from "gimp:point-layer-mode" to "gimp
  :multiply-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A43A0 from "gimp:point-layer-mode" to "gimp
  :screen-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A4790 from "gimp:point-layer-mode" to "gimp
  :overlay-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A4BC0 from "gimp:point-layer-mode" to "gimp
  :difference-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A5800 from "gimp:point-layer-mode" to "gimp
  :addition-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A5BC0 from "gimp:point-layer-mode" to "gimp
  :subtract-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A5F80 from "gimp:point-layer-mode" to "gimp
  :darken-only-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A63D0 from "gimp:point-layer-mode" to "gimp
  :lighten-only-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A68E0 from "gimp:point-layer-mode" to "gimp:hue-
  mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A6B40 from "gimp:point-layer-mode" to "gimp
  :saturation-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A6F70 from "gimp:point-layer-mode" to "gimp:color-
  mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A73E0 from "gimp:point-layer-mode" to "gimp:value-
  mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A7760 from "gimp:point-layer-mode" to "gimp
  :divide-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A7BE0 from "gimp:point-layer-mode" to "gimp:dodge-
  mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A7F50 from "gimp:point-layer-mode" to "gimp:burn-
  mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A83A0 from "gimp:point-layer-mode" to "gimp
  :hardlight-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A8740 from "gimp:point-layer-mode" to "gimp
  :softlight-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A8B40 from "gimp:point-layer-mode" to "gimp:grain-
  extract-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A90A0 from "gimp:point-layer-mode" to "gimp:grain-
  merge-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A93C0 from "gimp:point-layer-mode" to "gimp:color-
  erase-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20A9730 from "gimp:point-layer-mode" to "gimp:erase-
  mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20AA080 from "gimp:point-layer-mode" to "gimp
  :replace-mode"

  (gimp:413): GEGL-gegl-operation.c-WARNING **: Cannot change name of
  operation class 0x20AA450 from "gimp:point-layer-mode" to "gimp:anti-
  erase-mode"

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