Travis: Still trying to fix problems with PostgreSQL 11

.travis.yml

@@ -39,16 +39,18 @@ script:
   - tox -e $TOXENV
 
 addons:
-  # test with last version that still supports OIDs
+  # last PostgreSQL version that still supports OIDs (11)
   postgresql: "11"
+  apt:
+    packages:
+    - postgresql-11
+    - postgresql-server-dev-11
 
 services:
   - postgresql
 
 before_script:
   - sudo service postgresql stop
-  - sudo apt-get remove -y postgresql\*
-  - sudo apt-get install postgresql-11 postgresql-client-11
   - sudo -u postgres sed -i "s/port = 54[0-9][0-9]/port = 5432/" /etc/postgresql/11/main/postgresql.conf
   - sudo service postgresql start 11
   - sudo -u postgres psql -c 'create database unittest'

setup.py

@@ -116,18 +116,21 @@ class build_pg_ext(build_ext):
         ('escaping-funcs', None, "enable string escaping functions"),
         ('no-escaping-funcs', None, "disable string escaping functions"),
         ('ssl-info', None, "use new ssl info functions"),
-        ('no-ssl-info', None, "do not use new ssl info functions")]
+        ('no-ssl-info', None, "do not use new ssl info functions"),
+        ('memory-size', None, "enable new memory size function"),
+        ('no-memory-size', None, "disable new memory size function")]
 
     boolean_options = build_ext.boolean_options + [
         'strict', 'direct-access', 'large-objects', 'default-vars',
-        'escaping-funcs', 'ssl-info']
+        'escaping-funcs', 'ssl-info', 'memory-size']
 
     negative_opt = {
         'no-direct-access': 'direct-access',
         'no-large-objects': 'large-objects',
         'no-default-vars': 'default-vars',
         'no-escaping-funcs': 'escaping-funcs',
-        'no-ssl-info': 'ssl-info'}
+        'no-ssl-info': 'ssl-info',
+        'no-memory-size': 'memory-size'}
 
     def get_compiler(self):
         """Return the C compiler used for building the extension."""

tox.ini

@@ -19,5 +19,5 @@ commands =
 
 [testenv]
 commands =
-    python setup.py clean --all build_ext --force --inplace --strict
+    python setup.py clean --all build_ext --force --inplace --strict --ssl-info --memory-size
     python -m unittest discover {posargs}