diff --git a/NEWS.rst b/NEWS.rst
index de8bb9e74b1acaa6710891e547907b1b2219d7dd_TkVXUy5yc3Q=..1f4ef9a3fe02c06621054e996709d1e328ed8938_TkVXUy5yc3Q= 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -2,6 +2,11 @@
 History
 =======
 
+20.12.1
+-------
+
+do_tests.zsh: Fix pg_extensions use, and allow setting unaccent to install it.
+
 20.12.0
 -------
 
@@ -10,7 +15,7 @@
 20.11.0
 -------
 
-do_tests.zsh: allow using env var pg_extension to describe extensions to install. Allow compatibility with modules
+do_tests.zsh: allow using env var pg_extensions to describe extensions to install. Allow compatibility with modules
 requiring a specific extension.
 
 20.10.1
diff --git a/do_tests.zsh b/do_tests.zsh
index de8bb9e74b1acaa6710891e547907b1b2219d7dd_ZG9fdGVzdHMuenNo..1f4ef9a3fe02c06621054e996709d1e328ed8938_ZG9fdGVzdHMuenNo 100755
--- a/do_tests.zsh
+++ b/do_tests.zsh
@@ -31,5 +31,4 @@
     dbowner=$(read_configuration_key ${project_home}/conf/dev/odoo.conf options db_user)
     unaccent=$(read_configuration_key ${project_home}/conf/dev/odoo.conf options unaccent False)
 else
-    echo "$DEBUG Use default owner and unaccent"
     dbowner=odoo
@@ -35,5 +34,6 @@
     dbowner=odoo
-    unaccent=False
+    unaccent=${unaccent-False}
+    echo "$DEBUG Use default owner ($dbowner) and unaccent ($unaccent)"
 fi
 echo "$DEBUG Looking for modules to install"
 module_list=${ODOO_SCRIPTS_MODULE_LIST-$(read_odoo_scripts_expandable_configuration_key module_list)}
@@ -122,7 +122,7 @@
 extensions+=($(read_odoo_scripts_configuration_key pg.extensions))
 # for modules without configuration file, allow environment variable
 # (expected format is space separated extensions
-if [[ -z "$pg_extensions" ]];
+if [[ -n "$pg_extensions" ]];
 then
   extensions+=( ${(s: :)pg_extensions} )
 fi
@@ -126,7 +126,9 @@
 then
   extensions+=( ${(s: :)pg_extensions} )
 fi
-for extension in $extensions; do
+echo "$DEBUG postgres extensions $extensions"
+for extension in $extensions;
+do
     echo "$INFO Create extension $extension in '$dbname'"
     psql $PG_HOST $PG_USER $dbname -c "CREATE EXTENSION IF NOT EXISTS $extension;"
 done