DuplicatedSlotName while installing in Pharo 7

[hernanmd]

When loading into a clean Pharo 7, during OpenPonk-Trachel compilation I received:

DuplicatedSlotName: Slot #'width' appeared twice in OPTRArcShape

Installation script:

Metacello new
	baseline: 'OpenPonk';
	repository: 'github://openponk/OpenPonk';
	load.

[hernanmd]

In #4

[JanBliznicenko]

Hello, we started working on updating for Pharo 7 and 8. At this moment, master branches of OpenPonk itself, class-editor, borm-editor, fsm-editor and petrinets can be loaded and opened on Pharo 7 and 8.
However, making it load does not mean it works yet :) Many essential things do not work properly yet, including canvas refreshing, adding associations (on Pharo 8) as well as our builds on openponk.org.
I believe all of that will be fixed soon™ :)