Revert "Revert "Merge pull request #9543 from NixOS/staging.post-15.06""

This reverts commit 741bf840da.

This reverts the fallout from reverting the major changes.

pkgs/applications/version-management/subversion/default.nix

@@ -8,6 +8,7 @@
 , stdenv, fetchurl, apr, aprutil, zlib, sqlite
 , apacheHttpd ? null, expat, swig ? null, jdk ? null, python ? null, perl ? null
 , sasl ? null, serf ? null
+, branch ? "1.9"
 }:
 
 assert bdbSupport -> aprutil.bdbSupport;
@@ -15,15 +16,26 @@ assert httpServer -> apacheHttpd != null;
 assert pythonBindings -> swig != null && python != null;
 assert javahlBindings -> jdk != null && perl != null;
 
+let
+  config = {
+    "1.9".ver_min = "2";
+    "1.9".sha1 = "fb9db3b7ddf48ae37aa8785872301b59bfcc7017";
+
+    "1.8".ver_min = "14";
+    "1.8".sha1 = "0698efc58373e7657f6dd3ce13cab7b002ffb497";
+  };
+in
+assert builtins.hasAttr branch config;
+
 stdenv.mkDerivation (rec {
 
-  version = "1.9.2";
+  version = "${branch}." + config.${branch}.ver_min;
 
   name = "subversion-${version}";
 
   src = fetchurl {
     url = "mirror://apache/subversion/${name}.tar.bz2";
-    sha1 = "fb9db3b7ddf48ae37aa8785872301b59bfcc7017";
+    inherit (config.${branch}) sha1;
   };
 
   buildInputs = [ zlib apr aprutil sqlite ]