Can't Install Eric IDE

I’m trying to install Eric-5.2.5:5.
It fails, saying I need to set the USE_PYTHON and PYTHON_TARGETS.
I have Python 3 installed.
Is there anyway of setting these to use Python 3 without breaking
my system?

Try to add to the file /etc/make.conf:

USE_PYTHON="3.2"
USE="${USE} python_targets_python3_2"