Python IDE eric-3.8.0 is stable on ~amd64 with Qscintilla 1.6.5. The earlier version had a depenency on <qscintilla-1.6.
3.8.0 is not in portage, can't test it well like that ;)
Created attachment 73403 [details] eric-3.8.0 ebuild This is the ebuild I used to install eric-3.8.0.
*** Bug 116718 has been marked as a duplicate of this bug. ***
3.8.1 in cvs