diff --git a/files/debs/general b/files/debs/general
index 1460526..80e81f5 100644
--- a/files/debs/general
+++ b/files/debs/general
@@ -20,8 +20,10 @@
 python-gdbm # needed for testr
 bc
 libyaml-dev
-libffi-dev
+libffi-dev # for pyOpenSSL
 libssl-dev # for pyOpenSSL
+libxml2-dev  # lxml
+libxslt1-dev  # lxml
 gettext  # used for compiling message catalogs
 openjdk-7-jre-headless  # NOPRIME
 pkg-config