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diff --git a/eclass/common-lisp-common-3.eclass b/eclass/common-lisp-common-3.eclass
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+# Copyright 1999-2004 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/eclass/common-lisp-common-3.eclass,v 1.1 2006/11/09 02:26:43 mkennedy Exp $
+#
+# Author Matthew Kennedy <mkennedy@gentoo.org>
+#
+# Sundry code common to many Common Lisp related ebuilds.  Some
+# implementation use the Portage time stamp hack to ensure their
+# installed files have the right modification time relative to each
+# other.
+
+inherit eutils
+
+CLSOURCEROOT=/usr/share/common-lisp/source/
+CLSYSTEMROOT=/usr/share/common-lisp/systems/
+
+# Many of our Common Lisp ebuilds are either inspired by, or actually
+# use packages and files from the Debian project's archives.
+
+do-debian-credits() {
+	docinto debian
+	for i in copyright README.Debian changelog; do
+		test -f $i && dodoc ${S}/debian/${i}
+	done
+	docinto .
+}
+
+# BIG FAT HACK: Since the Portage emerge step kills file timestamp
+# information, we need to compensate by ensuring all FASL files are
+# more recent than their source files.
+
+# The following `impl-*-timestamp-hack' functions SHOULD NOT be used
+# outside of this eclass.
+
+# Bug http://bugs.gentoo.org/show_bug.cgi?id=16162 should remove the
+# need for this hack.
+
+impl-save-timestamp-hack() {
+	local impl=$1
+	dodir /usr/share/${impl}
+	tar cpjf ${D}/usr/share/${impl}/portage-timestamp-compensate -C ${D}/usr/$(get_libdir)/${impl} .
+}
+
+impl-restore-timestamp-hack() {
+	local impl=$1
+	tar xjpfo /usr/share/${impl}/portage-timestamp-compensate -C /usr/$(get_libdir)/${impl}
+}
+
+impl-remove-timestamp-hack() {
+	local impl=$1
+	rm -rf /usr/$(get_libdir)/${impl} &>/dev/null || true
+}
+
+standard-impl-postinst() {
+	local impl=$1
+	case ${impl} in
+		cmucl|sbcl)
+			impl-restore-timestamp-hack ${impl}
+			;;
+		*)
+			;;
+	esac
+}
+
+standard-impl-postrm() {
+	local impl=$1 impl_binary=$2
+	if [ ! -x ${impl_binary} ]; then
+		case ${impl} in
+			cmucl|sbcl)
+				impl-remove-timestamp-hack ${impl}
+				;;
+			*)
+				;;
+		esac
+		rm -rf /var/cache/common-lisp-controller/*/${impl}
+	fi
+}
+
+# Local Variables: ***
+# mode: shell-script ***
+# tab-width: 4 ***
+# End: ***