Add portage bashrc

etc/portage/bashrc

@@ -0,0 +1,17 @@
+# vim: set ft=sh :
+
+post_src_prepare() {
+	if [[ $(type -t epatch_user) = function ]]; then
+		cd "${S}"
+		epatch_user
+	fi
+}
+
+case ${EBUILD_PHASE} in
+preinst|prerm)
+	for fs in / /usr /opt; do
+		mountpoint -q ${fs} || continue
+		test -w ${fs} || mount -oremount,rw ${fs}
+	done
+	;;
+esac