Fix build [1] and update to mailgraph-0.22 [2]

Submitted by: Olivier Tharan <olive@oban.frmug.org> [1] (based on),

		Gea-Suan Lin <gslin@Infomath.math.NCTU.edu.tw> (maintainer)

PR: ports/43637 [1], ports/43350 [2]