diff --git a/modules/services/web-servers/apache-httpd/subversion.nix b/modules/services/web-servers/apache-httpd/subversion.nix
index d9febdf44c01..e10156432dc3 100644
--- a/modules/services/web-servers/apache-httpd/subversion.nix
+++ b/modules/services/web-servers/apache-httpd/subversion.nix
@@ -137,7 +137,7 @@ let
     <Location ${urlPrefix}/viewvc>
         AddHandler python-program .py
         # Note: we write \" instead of ' to work around a lexer bug in Nix 0.11.
-        PythonPath "[\"${viewvc}/viewvc/bin/mod_python\", \"${subversion}/lib/python2.5/site-packages\"] + sys.path"
+        PythonPath "[\"${viewvc}/viewvc/bin/mod_python\", \"${subversion}/lib/${pkgs.python.libPrefix}/site-packages\"] + sys.path"
         PythonHandler handler
         ${viewerConfig "viewvc"}
     </Location>
@@ -333,7 +333,7 @@ in {
   # mod_python's own Python modules must be in the initial Python
   # path, they cannot be set through the PythonPath directive.
   globalEnvVars = [
-    { name = "PYTHONPATH"; value = "${pkgs.mod_python}/lib/python2.5/site-packages"; }
+    { name = "PYTHONPATH"; value = "${pkgs.mod_python}/lib/${pkgs.python.libPrefix}/site-packages"; }
   ];
 
   
diff --git a/modules/services/web-servers/apache-httpd/trac.nix b/modules/services/web-servers/apache-httpd/trac.nix
index d5588e1162c0..61cb2fbca043 100644
--- a/modules/services/web-servers/apache-httpd/trac.nix
+++ b/modules/services/web-servers/apache-httpd/trac.nix
@@ -1,7 +1,8 @@
 { config, pkgs, serverInfo, ... }:
 
+with pkgs.lib;
+
 let
-  inherit (pkgs.lib) mkOption;
   
   # Build a Subversion instance with Apache modules and Swig/Python bindings.
   subversion = pkgs.subversion.override (origArgs: {
@@ -11,9 +12,15 @@ let
     compressionSupport = true;
     pythonBindings = true;
   });
+
+  pythonLib = p: "${p}/";
+  
 in
+
 {
+
   options = {
+  
     projectsLocation = mkOption {
       description = "URL path in which Trac projects can be accessed";
       default = "/projects";
@@ -22,30 +29,29 @@ in
     projects = mkOption {
       description = "List of projects that should be provided by Trac. If they are not defined yet empty projects are created.";
       default = [];
-      example = [ { identifier = "myproject";
-                    name = "My Project";
-                    databaseURL="postgres://root:password@/tracdb";
-                    subversionRepository="/data/subversion/myproject"; } ];
+      example =
+        [ { identifier = "myproject";
+            name = "My Project";
+            databaseURL="postgres://root:password@/tracdb";
+            subversionRepository="/data/subversion/myproject";
+          }
+        ];
     };
     
     user = mkOption {
       default = "wwwrun";
-      description = "
-        User account under which Trac runs.
-      ";
+      description = "User account under which Trac runs.";
     };
 
     group = mkOption {
       default = "wwwrun";
-      description = "
-        Group under which Trac runs.
-      ";
+      description = "Group under which Trac runs.";
     };
+    
   };
 
-  extraModules = [
-    { name = "python"; path = "${pkgs.mod_python}/modules/mod_python.so"; }
-  ];
+  extraModules = singleton
+    { name = "python"; path = "${pkgs.mod_python}/modules/mod_python.so"; };
   
   extraConfig = ''
     <Location ${config.projectsLocation}>
@@ -57,29 +63,31 @@ in
     </Location>
   '';
   
-  globalEnvVars = [
+  globalEnvVars = singleton
     { name = "PYTHONPATH";
-      value = 
-        "${pkgs.mod_python}/lib/python2.5/site-packages:" +
-	"${pkgs.pythonPackages.trac}/lib/python2.5/site-packages:" +
-	"${pkgs.setuptools}/lib/python2.5/site-packages:" +
-	"${pkgs.pythonPackages.genshi}/lib/python2.5/site-packages:" +
-	"${pkgs.pythonPackages.psycopg2}/lib/python2.5/site-packages:" +
-	"${subversion}/lib/python2.5/site-packages";
-    }
-  ];
+      value =
+        makeSearchPath "lib/${pkgs.python.libPrefix}/site-packages"
+          [ pkgs.mod_python
+            pkgs.pythonPackages.trac
+            pkgs.setuptools
+            pkgs.pythonPackages.genshi
+            pkgs.pythonPackages.psycopg2
+            subversion
+          ];
+    };
   
   startupScript = pkgs.writeScript "activateTrac" ''
     mkdir -p /var/trac
     chown ${config.user}:${config.group} /var/trac
     
-    ${pkgs.lib.concatMapStrings (project:
+    ${concatMapStrings (project:
       ''
         if [ ! -d /var/trac/${project.identifier} ]
 	then
-	    export PYTHONPATH=${pkgs.pythonPackages.psycopg2}/lib/python2.5/site-packages
+	    export PYTHONPATH=${pkgs.pythonPackages.psycopg2}/lib/${pkgs.python.libPrefix}/site-packages
 	    ${pkgs.pythonPackages.trac}/bin/trac-admin /var/trac/${project.identifier} initenv "${project.name}" "${project.databaseURL}" svn "${project.subversionRepository}"
 	fi
       '' ) (config.projects)}
   '';
+  
 }
diff --git a/release.nix b/release.nix
index de9fb2a5fe2d..91aa722e2a94 100644
--- a/release.nix
+++ b/release.nix
@@ -109,10 +109,6 @@ let
     minimal_install_archive = {system ? "i686-linux"}: (iso_minimal {inherit system;})
       .config.system.build.minimalInstallArchive;
 
-    # the archive installer can't be tested without chroot which requires being root
-    # options: run in kvm or uml ?
-    # TODO
-
     tests = 
       { services ? ../services }:
       let
diff --git a/tests/trac.nix b/tests/trac.nix
index 4a2fc665bf77..59f19310dee9 100644
--- a/tests/trac.nix
+++ b/tests/trac.nix
@@ -64,7 +64,7 @@
       
       $webserver->waitForFile("/var/trac");      
       $webserver->mustSucceed("mkdir -p /var/trac/projects/test");
-      $webserver->mustSucceed("PYTHONPATH=${pkgs.pythonPackages.psycopg2}/lib/python2.5/site-packages trac-admin /var/trac/projects/test initenv Test postgres://root\@postgresql/trac svn /repos/trac");
+      $webserver->mustSucceed("PYTHONPATH=${pkgs.pythonPackages.psycopg2}/lib/${pkgs.python.libPrefix}/site-packages trac-admin /var/trac/projects/test initenv Test postgres://root\@postgresql/trac svn /repos/trac");
       
       $client->waitForX;
       $client->execute("konqueror http://webserver/projects/test &");