wow, thank you lunokhod, I was totally looking in the wrong direction... not building in the depends folder was my error. I needed to "cd depends" after autogen.sh
I'm used to stick to the README and INSTALL files when I'm compiling, and the instructions in the INSTALL file of the anoncoin-developp-themes were:
./autogen.sh
./configure
make
make install
Next time I'll look more carrefully in the wiki before posting here.
So now I have another building problem:
I ran autogen.sh in the root of the anoncoin-developp-themes uncompressed folder, then ran cd depends, and make.
But after 20 minutes or so, it is stuck at "fetching qt46", and top command shows no cpu activity for that task. I stopped, ran make again, same thing. All dependencies are satisfied by the way.