Can't get rid of ModemManager

[jhon987]

Hi,
I'm using a rather old SIEMENS-sl2-141 router on a wired (connection) PC, thus I believe I don't need ModemManager package.
the thing is, when I try to remove the package, I keep getting this upon emerge -ac:

[eccerr0r]

Saw this issue before: https://forums.gentoo.org/viewtopic-t-986356-highlight-.html
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Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSD
What am I supposed watching?

[jhon987]