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Do I have to expect any disadvantages when using such a mixed framework (e.g. bigger inkscape files)? - In the case - is there an easy way to get back to a PPC only environment?

If inkscape is the only port you tried to install universally, use this: sudo port upgrade --force depof:inkscape -universal

Wouldn't --enforce-variants be preferable here rather than --force?

I agree, this would be the better choice.

Thanks, I'll give that a try and report back.

I obtained a 400 MHz G4 384 MB RAM PowerBook - this will be quite hard work for that little machine… (-;

Greetings,

Wolf