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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1576977 Title: Lots of GEGL-gegl-operation.c-WARNING on starting gimp To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1576977/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs