Ok, then Alembic is a necessary dependency for meshroom to be able to finish the job?
I have entered to the “build” folder where AliceVision had previously compiled. I opened “CMakeCache.txt” with cmake-gui and configured these two parameters:
ALICEVISION_USE_ALEMBIC ON
Alembic_DIR /opt/lib/alembic-1.7.1/lib/cmake/Alembic/
(is where Blender install_deps.sh install it)
Then Configure, Generate and run “make” from terminal again.
Now it has been able to pass “PrepareDenseScene” stage, and now it is processing DepthMap (using GPU apparently). So, now waiting for it to end without errors 
Thank you!