With running (mostly) stable (did a "dist-upgrade -t stable" a few days
ago), the command
$ apt-get install gimp -t testing
...
Holen:1 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libbabl-0.1-0 amd64 0.1.56-1 [261 kB]
Holen:2 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libraw19 amd64 0.19.0-3 [292 kB]
Holen:3 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgegl-common all 0.4.8-1 [1.147 kB]
Holen:4 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgegl-0.4-0 amd64 0.4.8-1+b1 [1.509 kB]
Holen:5 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgexiv2-2 amd64 0.10.8-1 [48,2 kB]
Holen:6 http://cdn-fastly.deb.debian.org/debian testing/main amd64
gtk2-engines-pixbuf amd64 2.24.32-3 [60,3 kB]
Holen:7 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgtk2.0-bin amd64 2.24.32-3 [48,5 kB]
Holen:8 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgail-common amd64 2.24.32-3 [156 kB]
Holen:9 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgail18 amd64 2.24.32-3 [55,5 kB]
Holen:10 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgtk2.0-0 amd64 2.24.32-3 [1.809 kB]
Holen:11 http://cdn-fastly.deb.debian.org/debian testing/main amd64
gimp amd64 2.10.6-2 [6.303 kB]
Holen:12 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libgimp2.0 amd64 2.10.6-2 [3.128 kB]
Holen:13 http://cdn-fastly.deb.debian.org/debian testing/main amd64
gimp-data all 2.10.6-2 [16,1 MB]
Holen:14 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libheif1 amd64 1.3.2-1 [126 kB]
Holen:15 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libmypaint-common all 1.3.0-2 [80,1 kB]
Holen:16 http://cdn-fastly.deb.debian.org/debian testing/main amd64
libmypaint-1.3-0 amd64 1.3.0-2 [31,7 kB]
isn't enough: starting gimp gives
Liblcms2 version mismatch!
GIMP was compiled against LittleCMS version 2.9, but the
LittleCMS version found at runtime is only 2.8.
so the dependencies need some more tightening.
