diff --git a/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix b/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix
index f2e814543db..2866c94d3d7 100644
--- a/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix
+++ b/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension
diff --git a/pkgs/servers/sql/postgresql/ext/pg_bigm.nix b/pkgs/servers/sql/postgresql/ext/pg_bigm.nix
index a8e5a54bc29..055d1de3c78 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_bigm.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_bigm.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     mkdir -p $out/bin    # For buildEnv to setup proper symlinks. See #22653
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension
diff --git a/pkgs/servers/sql/postgresql/ext/pg_cron.nix b/pkgs/servers/sql/postgresql/ext/pg_cron.nix
index d2d2a00ffd5..15d67017189 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_cron.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_cron.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension
diff --git a/pkgs/servers/sql/postgresql/ext/pg_hll.nix b/pkgs/servers/sql/postgresql/ext/pg_hll.nix
index bccec1107b9..040ff8b80fe 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_hll.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_hll.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension
diff --git a/pkgs/servers/sql/postgresql/ext/pg_partman.nix b/pkgs/servers/sql/postgresql/ext/pg_partman.nix
index 38e86fbfd8d..5fbe757598c 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_partman.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_partman.nix
@@ -14,8 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/bin    # For buildEnv to setup proper symlinks. See #22653
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp src/*.so      $out/lib
     cp updates/*     $out/share/postgresql/extension
diff --git a/pkgs/servers/sql/postgresql/ext/pg_topn.nix b/pkgs/servers/sql/postgresql/ext/pg_topn.nix
index 1a5aa91ae6e..b9015be781e 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_topn.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_topn.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension
diff --git a/pkgs/servers/sql/postgresql/ext/temporal_tables.nix b/pkgs/servers/sql/postgresql/ext/temporal_tables.nix
index ac0299208f8..7a4b1ed88fc 100644
--- a/pkgs/servers/sql/postgresql/ext/temporal_tables.nix
+++ b/pkgs/servers/sql/postgresql/ext/temporal_tables.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{bin,lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5e9eb55dbab..671ea1b9fef 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14844,6 +14844,7 @@ in
   ;
   postgresql = postgresql_9_6.override { this = postgresql; };
   postgresqlPackages = recurseIntoAttrs postgresql.pkgs;
+  postgresql11Packages = recurseIntoAttrs postgresql_11.pkgs;
 
   postgresql_jdbc = callPackage ../development/java-modules/postgresql_jdbc { };