If yes, then you might need a more recent one.
I am using the Debian testing package (0.93.3-12) and would like to
so it's most likely that this is why it doesn't load.
[...]
locally compiled (git) Gem. Do you think that compiling pix_opencv locally could also solve the problem?
maybe, but to be honnest I don't remember if pix_opencv uses recent Gem feature, it's worth a try compiling it against Gem 0.93-3
I did, and it throws the same error: _ZN9GemPixObj4SIMDEi
Will (have to) try to compile Gem from git, but this has to wait a few days.
best, Peter