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< IUSE="collada matplot"
---
> IUSE="collada matplot 3dmouse"
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> 	3dmouse? ( dev-libs/libspnav )
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> }
> 
> pkg_postinst() {
> 	elog "You need a device daemon like app-misc/spacenavd running"
> 	elog "to use the 3d mouse (space navigator) in FreeCAD."
> 	elog "To configure the mouse, go to Tools->Customize->Spaceball-Movement"
> 	elog "and Tools->Customize->Spaceball-Buttons. To make the buttons"
> 	elog "show up, press one of them."