diff --git a/contrib/bloom/bloom--1.0.sql b/contrib/bloom/bloom--1.0.sql
index 87b5442568..4e7c9226bc 100644
--- a/contrib/bloom/bloom--1.0.sql
+++ b/contrib/bloom/bloom--1.0.sql
@@ -1,4 +1,9 @@
-CREATE OR REPLACE FUNCTION blhandler(internal)
+/* contrib/bloom/bloom--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION bloom" to load this file. \quit
+
+CREATE FUNCTION blhandler(internal)
 RETURNS index_am_handler
 AS 'MODULE_PATHNAME'
 LANGUAGE C;
diff --git a/contrib/hstore_plperl/hstore_plperl--1.0.sql b/contrib/hstore_plperl/hstore_plperl--1.0.sql
index a4fd7c22db..9a64fcb18b 100644
--- a/contrib/hstore_plperl/hstore_plperl--1.0.sql
+++ b/contrib/hstore_plperl/hstore_plperl--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/hstore_plperl/hstore_plperl--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION hstore_plperl" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plperl';
 SELECT NULL::hstore;
diff --git a/contrib/hstore_plperl/hstore_plperlu--1.0.sql b/contrib/hstore_plperl/hstore_plperlu--1.0.sql
index 2c2e3e3848..f355284907 100644
--- a/contrib/hstore_plperl/hstore_plperlu--1.0.sql
+++ b/contrib/hstore_plperl/hstore_plperlu--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/hstore_plperl/hstore_plperlu--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION hstore_plperlu" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plperl';
 SELECT NULL::hstore;
diff --git a/contrib/hstore_plpython/hstore_plpython2u--1.0.sql b/contrib/hstore_plpython/hstore_plpython2u--1.0.sql
index a793dc9c0c..e3aea6399e 100644
--- a/contrib/hstore_plpython/hstore_plpython2u--1.0.sql
+++ b/contrib/hstore_plpython/hstore_plpython2u--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/hstore_plpython/hstore_plpython2u--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION hstore_plpython2u" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plpython2';
 SELECT NULL::hstore;
diff --git a/contrib/hstore_plpython/hstore_plpython3u--1.0.sql b/contrib/hstore_plpython/hstore_plpython3u--1.0.sql
index a85c85d4c1..a964a49059 100644
--- a/contrib/hstore_plpython/hstore_plpython3u--1.0.sql
+++ b/contrib/hstore_plpython/hstore_plpython3u--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/hstore_plpython/hstore_plpython3u--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION hstore_plpython3u" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plpython3';
 SELECT NULL::hstore;
diff --git a/contrib/hstore_plpython/hstore_plpythonu--1.0.sql b/contrib/hstore_plpython/hstore_plpythonu--1.0.sql
index e2e4721dca..d79bdc96d9 100644
--- a/contrib/hstore_plpython/hstore_plpythonu--1.0.sql
+++ b/contrib/hstore_plpython/hstore_plpythonu--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/hstore_plpython/hstore_plpythonu--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION hstore_plpythonu" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plpython2';  -- change to plpython3 if that ever becomes the default
 SELECT NULL::hstore;
diff --git a/contrib/ltree_plpython/ltree_plpython2u--1.0.sql b/contrib/ltree_plpython/ltree_plpython2u--1.0.sql
index f040bd3f56..62531371bf 100644
--- a/contrib/ltree_plpython/ltree_plpython2u--1.0.sql
+++ b/contrib/ltree_plpython/ltree_plpython2u--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/ltree_plpython/ltree_plpython2u--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION ltree_plpython2u" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plpython2';
 SELECT NULL::ltree;
diff --git a/contrib/ltree_plpython/ltree_plpython3u--1.0.sql b/contrib/ltree_plpython/ltree_plpython3u--1.0.sql
index 7afe51f148..3f21d1b721 100644
--- a/contrib/ltree_plpython/ltree_plpython3u--1.0.sql
+++ b/contrib/ltree_plpython/ltree_plpython3u--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/ltree_plpython/ltree_plpython3u--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION ltree_plpython3u" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plpython3';
 SELECT NULL::ltree;
diff --git a/contrib/ltree_plpython/ltree_plpythonu--1.0.sql b/contrib/ltree_plpython/ltree_plpythonu--1.0.sql
index 50f35dd16b..e8deadc62d 100644
--- a/contrib/ltree_plpython/ltree_plpythonu--1.0.sql
+++ b/contrib/ltree_plpython/ltree_plpythonu--1.0.sql
@@ -1,3 +1,8 @@
+/* contrib/ltree_plpython/ltree_plpythonu--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION ltree_plpythonu" to load this file. \quit
+
 -- make sure the prerequisite libraries are loaded
 LOAD 'plpython2';  -- change to plpython3 if that ever becomes the default
 SELECT NULL::ltree;
diff --git a/contrib/pgcrypto/pgcrypto--1.3.sql b/contrib/pgcrypto/pgcrypto--1.3.sql
index 90d0946de2..c2628caceb 100644
--- a/contrib/pgcrypto/pgcrypto--1.3.sql
+++ b/contrib/pgcrypto/pgcrypto--1.3.sql
@@ -1,4 +1,4 @@
-/* contrib/pgcrypto/pgcrypto--1.2.sql */
+/* contrib/pgcrypto/pgcrypto--1.3.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION pgcrypto" to load this file. \quit
diff --git a/contrib/pgrowlocks/pgrowlocks--1.2.sql b/contrib/pgrowlocks/pgrowlocks--1.2.sql
index 58df728c07..ff76b8b68a 100644
--- a/contrib/pgrowlocks/pgrowlocks--1.2.sql
+++ b/contrib/pgrowlocks/pgrowlocks--1.2.sql
@@ -1,4 +1,4 @@
-/* contrib/pgrowlocks/pgrowlocks--1.1.sql */
+/* contrib/pgrowlocks/pgrowlocks--1.2.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION pgrowlocks" to load this file. \quit
diff --git a/contrib/pgstattuple/pgstattuple--1.4.sql b/contrib/pgstattuple/pgstattuple--1.4.sql
index 69f2002566..47377ebe79 100644
--- a/contrib/pgstattuple/pgstattuple--1.4.sql
+++ b/contrib/pgstattuple/pgstattuple--1.4.sql
@@ -1,4 +1,4 @@
-/* contrib/pgstattuple/pgstattuple--1.3.sql */
+/* contrib/pgstattuple/pgstattuple--1.4.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION pgstattuple" to load this file. \quit
diff --git a/contrib/sslinfo/sslinfo--1.0--1.1.sql b/contrib/sslinfo/sslinfo--1.0--1.1.sql
index 4c26c6e1cf..12d341f207 100644
--- a/contrib/sslinfo/sslinfo--1.0--1.1.sql
+++ b/contrib/sslinfo/sslinfo--1.0--1.1.sql
@@ -3,7 +3,7 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "ALTER EXTENSION sslinfo UPDATE TO '1.1'" to load this file. \quit
 
-CREATE OR REPLACE FUNCTION
+CREATE FUNCTION
 ssl_extension_info(OUT name text,
 	OUT value text,
     OUT critical boolean