I wanted to have a GIMP on haiku, so I decided to do something with that. There were two paths to achieve this goal. The first one was to port a GTK+ and then replace X11 calls from a GIMP with the Haiku's ones (complex task). The second one was to port X11 to the Haiku (easy task). I chose the second path for now. The GIMP on haiku is quite stable except the bug #283 , which also affects Abiword and Gnumeric.
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How to install?
1. Install the latest "TiltOS for Haiku"
2. Install GIMP:
$ box -i gimp --no-deps
3. Install X11:
$ box -i xhaiku
How to run?
1. Start X11 server:
2. Run GIMP (from other terminal)
$ export DISPLAY=:0