we need to build aspell-en-dictionary when we update aspell.

component/aspell/buildout.cfg

@@ -15,6 +15,7 @@ stop-on-error = yes
 
 [aspell]
 recipe = slapos.recipe.cmmi
+revision = 1
 url = http://ftp.gnu.org/gnu/aspell/aspell-0.60.6.1.tar.gz
 md5sum = e66a9c9af6a60dc46134fdacf6ce97d7
 environment =
@@ -26,3 +27,6 @@ recipe = slapos.recipe.cmmi
 url = ftp://ftp.gnu.org/gnu/aspell/dict/en/aspell6-en-7.1-0.tar.bz2
 md5sum = beba5e8f3afd3ed1644653bb685b2dfb
 configure-command = ./configure --vars ASPELL=${aspell:location}/bin/aspell PREZIP=${aspell:location}/bin/prezip-bin
+depends =
+  ${aspell:url}
+  ${aspell:revision}