Thank you Martin for your report. I've contacted upstream who has already fixed the issue in a soon to be released new version.
- Bug#822474: mira: FTBFS: error: 'accumulate' is... Martin Michlmayr
- Bug#822474: marked as done (mira: FTBFS: e... Debian Bug Tracking System
- Bug#822474: mira: FTBFS: error: 'accumulat... Michael Crusoe
- Bug#822474: mira: FTBFS: error: 'accum... Andreas Tille