diff --git a/etc/default.nix b/etc/default.nix
index fedc3c34856d..5e2902f715a9 100644
--- a/etc/default.nix
+++ b/etc/default.nix
@@ -204,6 +204,7 @@ let
       "samba"
       "cups"
       "ftp"
+      "ejabberd"
       "common"
       "common-console" # shared stuff for interactive local sessions
     ]
diff --git a/etc/pam.d/ejabberd b/etc/pam.d/ejabberd
new file mode 100644
index 000000000000..50f3cc5ce607
--- /dev/null
+++ b/etc/pam.d/ejabberd
@@ -0,0 +1,4 @@
+auth     include        common
+account  include        common
+password include        common
+session  include        common
diff --git a/system/system.nix b/system/system.nix
index 9dd45a938d46..ef4e027848b5 100644
--- a/system/system.nix
+++ b/system/system.nix
@@ -108,6 +108,8 @@ rec {
       ];
       path =
         pkgs.lib.optionals (!config.environment.cleanStart) [
+        pkgs.acl
+        pkgs.attr
         pkgs.bashInteractive # bash with ncurses support
         pkgs.bzip2
         pkgs.coreutils
@@ -123,6 +125,7 @@ rec {
         pkgs.gzip
         pkgs.iputils
         pkgs.less
+        pkgs.libcap
         pkgs.lvm2
         pkgs.man
         pkgs.mdadm
diff --git a/upstart-jobs/ejabberd.nix b/upstart-jobs/ejabberd.nix
index 390feda0e096..31cc0b7efadb 100644
--- a/upstart-jobs/ejabberd.nix
+++ b/upstart-jobs/ejabberd.nix
@@ -71,7 +71,7 @@ mkIf config.services.ejabberd.enable {
               fi
               
               mkdir -p ${cfg.confDir}
-              sed -e 's|{hosts, \["localhost"\]}.|{hosts, \[${cfg.virtualHosts}\]}.|' ${pkgs.ejabberd}/etc/ejabberd/ejabberd.cfg > ${cfg.confDir}/ejabberd.cfg
+              test -f ${cfg.confDir}/ejabberd.cfg || sed -e 's|{hosts, \["localhost"\]}.|{hosts, \[${cfg.virtualHosts}\]}.|' ${pkgs.ejabberd}/etc/ejabberd/ejabberd.cfg > ${cfg.confDir}/ejabberd.cfg
         end script
         
         respawn ${pkgs.bash}/bin/sh -c 'export PATH=$PATH:${pkgs.ejabberd}/sbin; cd ~; ejabberdctl --logs ${cfg.logsDir} --spool ${cfg.spoolDir} --config ${cfg.confDir}/ejabberd.cfg start; sleep 1d'