my example for the slightly modified ebuild (diff)

fvwm-2.5.7-r5.diff (text/plain), 326 bytes, created by Felix Eckert on 2004-01-01 10:00:05 UTC

--- fvwm-2.5.7-r5.ebuild.org	2004-01-01 16:50:37.000000000 +0100
+++ fvwm-2.5.7-r5.ebuild	2004-01-01 18:49:01.000000000 +0100
@@ -272,6 +272,10 @@
 
 	# fix a couple of symlinks.
 	prepallman
+
+	# make a symlink /usr/lib/fvwm/current -> /usr/lib/fvwm/${PV}
+	cd ${D}/usr/lib/fvwm
+	ln -s ${PV} current
 }
 
 pkg_postinst() {