Arch Linux

openjpeg 1.5.2 [0] is the last release of the 1.x branch for openjpeg and was released on March 1, 2014. It recieves no more updates, no security fixes etc. The package openjpeg2 [1] is the 2.x branch and is currently at 2.3.1.

Currently, three packages depend on openjpeg: blender [2], mtpaint [3], openimageio [4]. All of these packages can be built with 2.3.1 (see below). calligra [5] has openjpeg as an optional dependency. This optional dependency can be removed since it is no longer supported [6].

blender: Internal cmake versions list 2.3.0 [7], blender install_deps.sh script [8] already lists package openjpeg2 for arch based distros.
mtpaint: According to the README [9], in order to reproduce the official win32 build, openjpeg 2.3.1 is needed.
openimageio: conanfile uses 2.3.1 [10]

There is also a request [11] to drop jasper [12], which also is a JPEG-2000 library, from the repos which has triggered another request [13] to replace gimp [14] dependency on jasper with openjpeg instead. If building with openjpeg, gimp requires at least version 2.1.0 [15], so if the request is implemented, it should depend on openjpeg2, and not add a dependency on openjpeg.

According to [11], libicns can use openjpeg instead of jasper. libicns supports building with openjpeg2 [17].

[0] https://www.archlinux.org/packages/extra/x86_64/openjpeg/
[1] https://www.archlinux.org/packages/extra/x86_64/openjpeg2/
[2] https://www.archlinux.org/packages/community/x86_64/blender/
[3] https://www.archlinux.org/packages/community/x86_64/mtpaint/
[4] https://www.archlinux.org/packages/community/x86_64/openimageio/
[5] https://www.archlinux.org/packages/extra/x86_64/calligra/
[6] https://github.com/KDE/calligra/commit/2f38f30a0f12e5f1d8b485f6d61158d6f2a41056
[7] https://developer.blender.org/diffusion/B/browse/master/build_files/build_environment/cmake/versions.cmake;v2.82a$203
[8] https://developer.blender.org/diffusion/B/browse/master/build_files/build_environment/install_deps.sh;v2.82a$4031
[9] https://github.com/wjaguar/mtPaint/blob/91676e939e1198fa536a0cdefbcd9331c70efc4c/gtk/README#L187
[10] https://github.com/OpenImageIO/oiio/blob/RB-2.1.11/conanfile.txt
[11] https://bugs.archlinux.org/index.php?do=details&task_id=64655
[12] https://www.archlinux.org/packages/extra/x86_64/jasper/
[13] https://bugs.archlinux.org/index.php?do=details&task_id=64655
[14] https://www.archlinux.org/packages/extra/x86_64/gimp/
[15] https://gitlab.gnome.org/GNOME/gimp/-/blob/GIMP_2_10_18/configure.ac#L74
[16] https://www.archlinux.org/packages/community/x86_64/libicns/
[17] https://sourceforge.net/p/icns/code/ci/6038a728f5886625c02e0edbaf4939e8b2954a25/