evolution: fixed to disable pst file import if libpst is not installed

gnome2/evolution/evolution.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../evolution/evolution.conf
-# Copyright (C) 2006 - 2007 The OpenSDE Project
+# Copyright (C) 2006 - 2011 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2004 Clifford Wolf
 #
@@ -48,4 +48,6 @@ var_append confopt ' ' "--enable-plugins=all"
 # openldap-libsuff.patch)
 export libsuff=${libdir##*/lib}
 
-
+if ! pkginstalled -f libpst; then
+	var_append extraconfopt ' ' "--disable-pst-import"
+fi