you cannot set the A variable in ebuilds, but the following ebuilds have: app-gnustep/gnumail/gnumail-1.1.0_pre2.ebuild:A=GNUMail-${PV/_/}.tar.gz app-gnustep/gnumail/gnumail-1.1.0.ebuild:A=GNUMail-${PV}.tar.gz app-gnustep/gnumail/gnumail-1.1.0_pre2-r1.ebuild:A=GNUMail-${PV/_/}.tar.gz app-gnustep/gorm/gorm-0.2.6.ebuild:A=${P/g/G}.tar.gz app-gnustep/gorm/gorm-0.2.6-r1.ebuild:A=${P/g/G}.tar.gz app-gnustep/gorm/gorm-0.3.0.ebuild:A=${P/g/G}.tar.gz app-gnustep/projectcenter/projectcenter-0.3.5.ebuild:A=ProjectCenter-${PV}.tar.gz app-gnustep/affiche/affiche-0.6.0.ebuild:A=${P/a/A}.tar.gz app-gnustep/gridlock/gridlock-1.6.1.ebuild:A=${PN/g/G}-GNUstep-${PV}.tar.gz app-gnustep/helpviewer/helpviewer-0.3.ebuild:A=HelpViewer-${PV}.tgz app-gnustep/imageviewer/imageviewer-0.6.2.ebuild:A=ImageViewer-${PV}.tar.gz app-gnustep/terminal/terminal-0.9.4.ebuild:A=${P/t/T}.tar.gz
the ebuilds have been updated in portage. :)