add postgresql 9.4beta2

lib/licenses.nix

@@ -232,6 +232,11 @@ rec {
     fullName = "OpenSSL License";
   };
 
+  postgresql = spqd {
+    shortName = "PostgreSQL";
+    fullName = "PostgreSQL License";
+  };
+
   psfl = spdx {
     shortName = "Python-2.0";
     fullName = "Python Software Foundation License version 2";

pkgs/servers/sql/postgresql/9.4.x.nix

@@ -0,0 +1,44 @@
+{ stdenv, fetchurl, zlib, readline, libossp_uuid }:
+
+with stdenv.lib;
+
+let version = "9.4beta2"; in
+
+stdenv.mkDerivation rec {
+  name = "postgresql-${version}";
+
+  src = fetchurl {
+    url = "mirror://postgresql/source/v${version}/${name}.tar.bz2";
+    sha256 = "131q3b9hv4pw02xhjsfi5is9i7pp5f4srxwfdn8ifs9qb37hcx2n";
+  };
+
+  buildInputs = [ zlib readline ] ++ optionals (!stdenv.isDarwin) [ libossp_uuid ];
+
+  enableParallelBuilding = true;
+
+  makeFlags = [ "world" ];
+
+  configureFlags = optional (!stdenv.isDarwin)
+    ''
+      --with-ossp-uuid
+    '';
+
+  patches = [ ./disable-resolve_symlinks-94.patch ./less-is-more.patch ];
+
+  installTargets = [ "install-world" ];
+
+  LC_ALL = "C";
+
+  passthru = {
+    inherit readline;
+    psqlSchema = "9.4";
+  };
+
+  meta = {
+    homepage = http://www.postgresql.org/ ;
+    description = "A powerful, open source object-relational database system";
+    license = stdenv.lib.licenses.postgresql;
+    maintainers = with stdenv.lib.maintainers; [ aristid ocharles ];
+    hydraPlatforms = stdenv.lib.platforms.linux;
+  };
+}

pkgs/servers/sql/postgresql/disable-resolve_symlinks-94.patch

@@ -0,0 +1,12 @@
+--- a/src/common/exec.c	2014-09-04 20:19:12.236057588 +0200
++++ b/src/common/exec.c	2014-09-04 20:19:50.550251633 +0200
+@@ -218,6 +218,9 @@
+ static int
+ resolve_symlinks(char *path)
+ {
++	// On NixOS we *want* stuff relative to symlinks.
++	return 0;
++
+ #ifdef HAVE_READLINK
+ 	struct stat buf;
+ 	char		orig_wd[MAXPGPATH],

pkgs/top-level/all-packages.nix

@@ -7095,6 +7095,8 @@ let
 
   postgresql93 = callPackage ../servers/sql/postgresql/9.3.x.nix { };
 
+  postgresql94 = callPackage ../servers/sql/postgresql/9.4.x.nix { };
+
   postgresql_jdbc = callPackage ../servers/sql/postgresql/jdbc { };
 
   psqlodbc = callPackage ../servers/sql/postgresql/psqlodbc { };