diff --git a/pkgs/development/compilers/urweb/default.nix b/pkgs/development/compilers/urweb/default.nix
index 9bdc3131e6a3..e34d58efd010 100644
--- a/pkgs/development/compilers/urweb/default.nix
+++ b/pkgs/development/compilers/urweb/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
     export CCARGS="-I$out/include \
                    -L${mysql.lib}/lib/mysql \
-                   -L${postgresql}/lib \
+                   -L${postgresql.lib}/lib \
                    -L${sqlite.out}/lib";
   '';
 
diff --git a/pkgs/development/libraries/libdbi-drivers/default.nix b/pkgs/development/libraries/libdbi-drivers/default.nix
index da2919f6ee9b..f64174778b20 100644
--- a/pkgs/development/libraries/libdbi-drivers/default.nix
+++ b/pkgs/development/libraries/libdbi-drivers/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
   ] ++ optionals (postgresql != null) [
     "--with-pgsql"
     "--with-pgsql_incdir=${postgresql}/include"
-    "--with-pgsql_libdir=${postgresql}/lib"
+    "--with-pgsql_libdir=${postgresql.lib}/lib"
   ] ++ optionals (sqlite != null) [
     "--with-sqlite3"
     "--with-sqlite3-incdir=${sqlite.dev}/include/sqlite"
diff --git a/pkgs/development/libraries/qt-5/5.4/qtbase.nix b/pkgs/development/libraries/qt-5/5.4/qtbase.nix
index 652814a3fd1d..2b7052e1ca62 100644
--- a/pkgs/development/libraries/qt-5/5.4/qtbase.nix
+++ b/pkgs/development/libraries/qt-5/5.4/qtbase.nix
@@ -162,7 +162,7 @@ stdenv.mkDerivation {
   # PostgreSQL autodetection fails sporadically because Qt omits the "-lpq" flag
   # if dependency paths contain the string "pq", which can occur in the hash.
   # To prevent these failures, we need to override PostgreSQL detection.
-  PSQL_LIBS = optionalString (postgresql != null) "-L${postgresql}/lib -lpq";
+  PSQL_LIBS = optionalString (postgresql != null) "-L${postgresql.lib}/lib -lpq";
 
   propagatedBuildInputs = [
     xorg.libXcomposite libX11 libxcb libXext libXrender libXi
diff --git a/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix b/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix
index 1aba5c98d9c1..2bafa8deba4e 100644
--- a/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix
+++ b/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix
@@ -183,7 +183,7 @@ stdenv.mkDerivation {
   # PostgreSQL autodetection fails sporadically because Qt omits the "-lpq" flag
   # if dependency paths contain the string "pq", which can occur in the hash.
   # To prevent these failures, we need to override PostgreSQL detection.
-  PSQL_LIBS = optionalString (postgresql != null) "-L${postgresql}/lib -lpq";
+  PSQL_LIBS = optionalString (postgresql != null) "-L${postgresql.lib}/lib -lpq";
 
   propagatedBuildInputs = [
     xlibs.libXcomposite libX11 libxcb libXext libXrender libXi
diff --git a/pkgs/servers/sql/postgresql/default.nix b/pkgs/servers/sql/postgresql/default.nix
index cf4519a82327..09f3997fa14b 100644
--- a/pkgs/servers/sql/postgresql/default.nix
+++ b/pkgs/servers/sql/postgresql/default.nix
@@ -10,7 +10,8 @@ let
       inherit sha256;
     };
 
-    outputs = [ "out" "doc" ];
+    outputs = [ "out" "lib" "doc" ];
+    setOutputFlags = false; # $out retains configureFlags :-/
 
     buildInputs =
       [ zlib readline openssl ]
@@ -20,8 +21,11 @@ let
 
     makeFlags = [ "world" ];
 
-    configureFlags =
-      [ "--with-openssl" ]
+    configureFlags = [
+      "--with-openssl"
+      "--sysconfdir=/etc"
+      "--libdir=$(lib)/lib"
+    ]
       ++ lib.optional (stdenv.isDarwin)  "--with-uuid=e2fs"
       ++ lib.optional (!stdenv.isDarwin) "--with-ossp-uuid";
 
@@ -36,8 +40,12 @@ let
 
     postInstall =
       ''
+        _moveToOutput "lib/pgxs" "$out" # looks strange, but not deleting it
+        _moveToOutput "lib/*.a" "$out"
+        _moveToOutput "lib/libecpg*" "$out"
+
         # Prevent a retained dependency on gcc-wrapper.
-        substituteInPlace $out/lib/pgxs/src/Makefile.global --replace ${stdenv.cc}/bin/ld ld
+        substituteInPlace "$out/lib/pgxs/src/Makefile.global" --replace ${stdenv.cc}/bin/ld ld
       '';
 
     disallowedReferences = [ stdenv.cc ];
diff --git a/pkgs/tools/security/thc-hydra/default.nix b/pkgs/tools/security/thc-hydra/default.nix
index 26afe5e29904..71fbbf55a7ae 100644
--- a/pkgs/tools/security/thc-hydra/default.nix
+++ b/pkgs/tools/security/thc-hydra/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   preConfigure = ''
-   substituteInPlace configure --replace "\$LIBDIRS" "${openssl.out}/lib ${pcre.out}/lib ${libssh.out}/lib ${postgresql92}/lib"
+   substituteInPlace configure --replace "\$LIBDIRS" "${openssl.out}/lib ${pcre.out}/lib ${libssh.out}/lib ${postgresql92.lib}/lib"
    substituteInPlace configure --replace "\$INCDIRS" "${openssl.dev}/include ${pcre.dev}/include ${libssh.dev}/include ${postgresql92}/include"
   '';