diff --git a/SConstruct b/SConstruct
index 7c1164012..a94e8c667 100644
--- a/SConstruct
+++ b/SConstruct
@@ -16,8 +16,6 @@ Basic usage:
 """
 
 from buildutils import *
-import subst
-import platform, sys, os
 
 if not COMMAND_LINE_TARGETS:
     # Print usage help
@@ -42,10 +40,9 @@ if os.name == 'nt':
     else:
         extraEnvArgs['TARGET_ARCH'] = 'x86'
 
-env = Environment(tools=['default', 'textfile'],
+env = Environment(tools=['default', 'textfile', 'subst', 'recursiveInstall'],
                   **extraEnvArgs)
-env.AddMethod(RecursiveInstall)
-subst.TOOL_SUBST(env)
+
 add_RegressionTest(env)
 
 # ******************************************************
@@ -764,10 +761,6 @@ SConscript('build/tools/SConscript')
 inst = env.Install('$ct_datadir', mglob(env, pjoin('data','inputs'), 'cti', 'xml'))
 installTargets.extend(inst)
 
-# Install exp3to2.sh (used by some of the tests)
-inst = env.Install('$ct_bindir', pjoin('bin', 'exp3to2.sh'))
-installTargets.extend(inst)
-
 ### Meta-targets ###
 build_demos = Alias('demos', demoTargets)
 
diff --git a/buildutils.py b/site_scons/buildutils.py
similarity index 87%
rename from buildutils.py
rename to site_scons/buildutils.py
index 28b660392..b143ee0f5 100644
--- a/buildutils.py
+++ b/site_scons/buildutils.py
@@ -1,7 +1,7 @@
 import os
-import shutil
-import sys
 from os.path import join as pjoin
+import sys
+import platform
 import textwrap
 import re
 import subprocess
@@ -377,62 +377,3 @@ def listify(value):
     else:
         # Already a sequence. Return as a list
         return list(value)
-
-
-def RecursiveInstall(env, target, dir):
-    """
-    This tool adds the builder:
-
-        env.RecursiveInstall(target, path)
-
-    This is useful for doing:
-
-        k = env.RecursiveInstall(dir_target, dir_source)
-
-    and if any thing in dir_source is updated the install is rerun
-
-    It behaves similar to the env.Install builtin. However it expects
-    two directories and correctly sets up the dependencies between each
-    sub file instead of just between the two directories.
-
-    Note in also traverses the in memory node tree for the source
-    directory and can detect things that are not built yet. Internally
-    we use the env.Glob function for this support.
-
-    You can see the effect of this function by doing:
-
-        scons --tree=all,prune
-
-    and see the one to one correspondence between source and target
-    files within each directory.
-    """
-    nodes = _recursive_install(env, dir)
-
-    dir = env.Dir(dir).abspath
-    target = env.Dir(target).abspath
-
-    l = len(dir) + 1
-
-    relnodes = [n.abspath[l:] for n in nodes]
-
-    out = []
-    for n in relnodes:
-        t = os.path.join(target, n)
-        s = os.path.join(dir, n)
-        out.extend(env.InstallAs(env.File(t), env.File(s)))
-
-    return out
-
-
-def _recursive_install(env, path):
-    """ Helper function for RecursiveInstall """
-    nodes = env.Glob(os.path.join(path, '*'), strings=False)
-    nodes.extend(env.Glob(os.path.join(path, '*.*'), strings=False))
-    out = []
-    for n in nodes:
-        if n.isdir():
-            out.extend(_recursive_install(env, n.abspath))
-        else:
-            out.append(n)
-
-    return out
diff --git a/site_scons/site_tools/recursiveInstall.py b/site_scons/site_tools/recursiveInstall.py
new file mode 100644
index 000000000..70b473ad8
--- /dev/null
+++ b/site_scons/site_tools/recursiveInstall.py
@@ -0,0 +1,67 @@
+import os
+
+def RecursiveInstall(env, target, dir):
+    """
+    This tool adds the builder:
+
+        env.RecursiveInstall(target, path)
+
+    This is useful for doing:
+
+        k = env.RecursiveInstall(dir_target, dir_source)
+
+    and if any thing in dir_source is updated the install is rerun
+
+    It behaves similar to the env.Install builtin. However it expects
+    two directories and correctly sets up the dependencies between each
+    sub file instead of just between the two directories.
+
+    Note in also traverses the in memory node tree for the source
+    directory and can detect things that are not built yet. Internally
+    we use the env.Glob function for this support.
+
+    You can see the effect of this function by doing:
+
+        scons --tree=all,prune
+
+    and see the one to one correspondence between source and target
+    files within each directory.
+    """
+    nodes = _recursive_install(env, dir)
+
+    dir = env.Dir(dir).abspath
+    target = env.Dir(target).abspath
+
+    l = len(dir) + 1
+
+    relnodes = [n.abspath[l:] for n in nodes]
+
+    out = []
+    for n in relnodes:
+        t = os.path.join(target, n)
+        s = os.path.join(dir, n)
+        out.extend(env.InstallAs(env.File(t), env.File(s)))
+
+    return out
+
+
+def _recursive_install(env, path):
+    """ Helper function for RecursiveInstall """
+    nodes = env.Glob(os.path.join(path, '*'), strings=False)
+    nodes.extend(env.Glob(os.path.join(path, '*.*'), strings=False))
+    out = []
+    for n in nodes:
+        if n.isdir():
+            out.extend(_recursive_install(env, n.abspath))
+        else:
+            out.append(n)
+
+    return out
+
+
+def generate(env, **kw):
+    env.AddMethod(RecursiveInstall)
+
+
+def exists(env):
+    return True
diff --git a/subst.py b/site_scons/site_tools/subst.py
similarity index 98%
rename from subst.py
rename to site_scons/site_tools/subst.py
index 136e9f51d..b4ede6a4f 100644
--- a/subst.py
+++ b/site_scons/site_tools/subst.py
@@ -194,9 +194,7 @@ def SubstHeader(env, target, source):
                             SUBST_REPLACE=_SubstHeader_replace)
 
 
-# Create builders
-##############################################################################
-def TOOL_SUBST(env):
+def generate(env, **kw):
     # The generic builder
     subst = SCons.Action.Action(_subst_action, _subst_message)
     env['BUILDERS']['SubstGeneric'] = Builder(action=subst,
@@ -205,3 +203,7 @@ def TOOL_SUBST(env):
     # Additional ones
     env.AddMethod(SubstFile)
     env.AddMethod(SubstHeader)
+
+
+def exists(env):
+    return True