soelim (a part of groff package) is required to build varnish-2.0 and openldap.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41357 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/README.txt

@@ -30,6 +30,7 @@ Requirements to build ERP5 Appliance are:
  * make
  * patch
  * diff (also known as diffutils)
+ * groff
  * python (>=2.4) with development headers (to run buildout)
 
 Setup