diff -ruN portage-prefix-2.1.14.orig/bin/ebuild.sh portage-prefix-2.1.14/bin/ebuild.sh
--- portage-prefix-2.1.14.orig/bin/ebuild.sh	2006-07-13 11:08:55.000000000 +0200
+++ portage-prefix-2.1.14/bin/ebuild.sh	2006-07-13 11:09:51.000000000 +0200
@@ -153,6 +153,16 @@
 	fi
 }
 
+eprefix() {
+	[ $# -eq 1 ] || die "eprefix: needs exactly one argument"
+	if has_version "$1"; then
+		echo "${EPREFIX}"
+	else
+		eerror "eprefix: $1 not installed"
+	fi
+	return 0
+}
+
 has_version() {
 	if [ "${EBUILD_PHASE}" == "depend" ]; then
 		die "portageq calls (has_version calls portageq) are not allowed in the global scope"