With GIMP 2.9 updated and compiled today, and darktable 2.2.5 installed from Gentoo portage, GIMP 2.9 “sees” darktable, but in Preferences doesn’t provide an option to use darktable. Here’s a snippet from the GIMP terminal output:
[file-darktable.c] trying to call 'darktable' [file-darktable.c] stdout: this is darktable 2.2.5 copyright (c) 2009-2017 johannes hanika firstname.lastname@example.org compile options: bit depth is 64 bit normal build SSE2 optimized codepath enabled OpenMP support enabled OpenCL support disabled Lua support disabled Colord support disabled gPhoto2 support disabled GraphicsMagick support disabled OpenEXR support enabled [file-darktable.c] have_darktable: 0
Does “have_darktable: 0” mean that for some reason GIMP can’t actually use darktable even though clearly GIMP detects darktable?
If it’s relevant, I used a “use flag” that told portage to compile darktable using ImageMagick instead of GraphicsMagick.