Still learning !
I am less and less lost with Porteus and ventured in a batch of new softs.
It has worked successfully with simple programs.
I have seen GIMP, let's try !
The package manager indicate there were dependencies, successfully downloaded and so I had only one thing to do : activate.
At this stage, something strange happened, downloading started again ????
Eventually I could see GIMP, clicked on "activate" success !!!
GIMP is in the menu, but when I clicked on it I got a message

No panic !
With a console, I typed "gimp" and got the following :
guest@porteus:~$ gimp
gimp: error while loading shared libraries: libgegl-0.1.so.0: cannot open shared object file: No such file or directory
So, I understand libgegl-0.1 is absent, but I could not find anything in the package manager

Where can it be hidden ??
Any tip ?