Opencascade version 6.7.1 is available, released at 30 April 2014. Ebuild from 6.7.0 seems to work ok after bump Reproducible: Always
+*opencascade-6.7.1 (10 Jul 2014) + + 10 Jul 2014; Michael Weber <xmw@gentoo.org> +opencascade-6.7.1.ebuild, + -opencascade-6.5.0.ebuild: + Version bump (bug 515976) +