diff -Naur gnome-shell-extensions.orig/PKGBUILD gnome-shell-extensions/PKGBUILD
--- gnome-shell-extensions.orig/PKGBUILD	2013-03-31 20:42:59.717154000 +0200
+++ gnome-shell-extensions/PKGBUILD	2013-03-31 20:45:16.090336181 +0200
@@ -3,12 +3,13 @@
 
 pkgname=gnome-shell-extensions
 pkgver=3.8.0
-pkgrel=1
+pkgrel=2
 pkgdesc="Extensions for GNOME shell, including classic mode"
 arch=(any)
 url="http://live.gnome.org/GnomeShell/Extensions"
 license=(GPL2)
 depends=(gnome-shell)
+optdepends=('nautilus: required for the Classic session')
 makedepends=(intltool)
 install=gnome-shell-extensions.install
 source=(http://ftp.gnome.org/pub/GNOME/sources/$pkgname/${pkgver::3}/$pkgname-$pkgver.tar.xz)
@@ -16,7 +17,7 @@
 
 build() {
   cd $pkgname-$pkgver
-  ./configure --prefix=/usr --enable-extensions=all
+  ./configure --prefix=/usr --libexecdir=/usr/lib/gnome-session --enable-extensions=all
   make
 }