I did that before, and it worked very well, the maintainer updated the ebuild quickly so, same problem again! :D A new version of scrotwm is out, and it correct bug, and add some new cool features, Reproducible: Always
+*scrotwm-0.10.0 (27 Jan 2012) + + 27 Jan 2012; Michael Weber <xmw@gentoo.org> +scrotwm-0.10.0.ebuild, + +files/scrotwm-0.10.0-makefile.patch: + Version bump (bug 398831, thanks elvis4526 for the hint) +