diff --git a/SConstruct b/SConstruct
index a9f9c670cab5505c3d3043e0e7937c94c88f065c..17b1009e0f2121a07de9bc94da8d889e17d91e6f 100644
--- a/SConstruct
+++ b/SConstruct
@@ -7,9 +7,12 @@ import sys
 vars = Variables(None, ARGUMENTS)
 vars.Add(PathVariable('DESTDIR', "Root directory to install in (useful for packaging scripts)", None, PathVariable.PathIsDirCreate))
 vars.Add(PathVariable('prefix', "Where to install in the FHS", "/usr/local", PathVariable.PathAccept))
-vars.Add(ListVariable('bindings', 'Language bindings to build', 'none', ['python', 'perl', 'php']))
+vars.Add(ListVariable('bindings', 'Language bindings to build', 'none', ['dotnet', 'perl', 'php', 'python']))
 
-env = Environment(ENV = {'PATH' : os.environ['PATH']}, variables = vars, tools=['default', 'scanreplace'], toolpath=['tools'])
+env = Environment(ENV = {'PATH' : os.environ['PATH']},
+                  variables = vars,
+                  tools=['default', 'scanreplace', 'csharp/mono'],
+                  toolpath=['tools'])
 
 if not 'bindings' in env:
     env['bindings'] = []
diff --git a/tools/csharp/.hgignore b/tools/csharp/.hgignore
new file mode 100644
index 0000000000000000000000000000000000000000..b6261c931f0996160a00ccdfabe32d8647524398
--- /dev/null
+++ b/tools/csharp/.hgignore
@@ -0,0 +1 @@
+.*~
diff --git a/tools/csharp/README b/tools/csharp/README
new file mode 100644
index 0000000000000000000000000000000000000000..adff8b2e6a4386939c90363d276847a53a548734
--- /dev/null
+++ b/tools/csharp/README
@@ -0,0 +1 @@
+Grabbed from https://bitbucket.org/russel/scons_csharp, revision 058956ce21722f806a560c24305775f74dd71d3f 
diff --git a/tools/csharp/__init__.py b/tools/csharp/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..af4f51983579fa5ccfd0d522971b0a48ed6a27bf
--- /dev/null
+++ b/tools/csharp/__init__.py
@@ -0,0 +1,24 @@
+# -*- coding:utf-8; -*-
+
+# Copyright (c) 2012 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+from csharp import exists, generate
diff --git a/tools/csharp/csharp.py b/tools/csharp/csharp.py
new file mode 100644
index 0000000000000000000000000000000000000000..6b38b45319dc406bb1ea81ea1a8919d4c7af0028
--- /dev/null
+++ b/tools/csharp/csharp.py
@@ -0,0 +1,503 @@
+# -*- coding:utf-8; -*-
+
+# Copyright (c) 2009-10 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#  This C# Tool taken from http://www.scons.org/wiki/CsharpBuilder and amended
+#  by the patch from Issue 1912 at http://scons.tigris.org/issues/show_bug.cgi?id=1912
+
+#  Amended and extended by Russel Winder <russel.winder@concertant.com>
+
+#  On the SCons wiki page there are two distinct tools, one for the Microsoft C# system and one for Mono.
+#  This is an attempt to meld to two based initially on the Microsoft C# tool with amendmnets from the Mono
+#  tool.
+
+import os.path
+import SCons.Builder
+import SCons.Node.FS
+import SCons.Util
+from SCons.Node.Python import Value
+
+# needed for adding methods to environment
+from SCons.Script.SConscript import SConsEnvironment
+
+# parses env['VERSION'] for major, minor, build, and revision
+def parseVersion(env):
+    """parses env['VERSION'] for major, minor, build, and revision"""
+    if type(env['VERSION']) is tuple or type(env['VERSION']) is list:
+        major, minor, build, revision = env['VERSION']
+    elif type(env['VERSION']) is str:
+        major, minor, build, revision = env['VERSION'].split('.')
+        major = int(major)
+        minor = int(minor)
+        build = int(build)
+        revision = int(revision)
+    return (major, minor, build, revision)
+
+def getVersionAsmDirective(major, minor, build, revision):
+    return '[assembly: AssemblyVersion("%d.%d.%d.%d")]' % (major, minor, build, revision)
+
+def generateVersionId(env, target, source):
+    out = open(target[0].path, 'w')
+    out.write('using System;using System.Reflection;using System.Runtime.CompilerServices;using System.Runtime.InteropServices;\n')
+    out.write(source[0].get_contents())
+    out.close()
+
+# used so that we can capture the return value of an executed command
+def subprocess(cmdline):
+    """used so that we can capture the return value of an executed command"""
+    import subprocess
+    startupinfo = subprocess.STARTUPINFO()
+    startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+    proc = subprocess.Popen(cmdline, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                            stderr=subprocess.PIPE, startupinfo=startupinfo, shell=False)
+    data, err = proc.communicate()
+    return proc.wait(), data, err
+
+def generatePublisherPolicyConfig(env, target, source):
+    """this method assumes that source list corresponds to [0]=version, [1]=assembly base name, [2]=assembly file node"""
+    # call strong name tool against compiled assembly and parse output for public token
+    outputFolder = os.path.split(target[0].tpath)[0]
+    pubpolicy = os.path.join(outputFolder, source[2].name)
+    rv, data, err = subprocess('sn -T ' + pubpolicy)
+    import re
+    tok_re = re.compile(r"([a-z0-9]{16})[\r\n ]{0,3}$")
+    match = tok_re.search(data)
+    tok = match.group(1)
+
+    # calculate version range to redirect from
+    version = source[0].value
+    oldVersionStartRange = '%s.%s.0.0' % (version[0], version[1])
+    newVersion = '%s.%s.%s.%s' % (version[0], version[1], version[2], version[3])
+    build = int(version[2])
+    rev = int(version[3])
+
+    # on build 0 and rev 0 or 1, no range is needed. otherwise calculate range
+    if (build == 0 and (rev == 0 or rev == 1)):
+        oldVersionRange = oldVersionStartRange
+    else:
+        if rev - 1 < 0:
+            endRevisionRange = '99'
+            endBuildRange = str(build-1)
+        else:
+            endRevisionRange = str(rev - 1)
+            endBuildRange = str(build)
+            oldVersionEndRange = '%s.%s.%s.%s' % (version[0], version[1], endBuildRange, endRevisionRange)
+            oldVersionRange = '%s-%s' % (oldVersionStartRange, oldVersionEndRange)
+
+    # write .net config xml out to file
+    out = open(target[0].path, 'w')
+    out.write('''\
+ <configuration><runtime><assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+   <dependentAssembly>
+     <assemblyIdentity name="%s" publicKeyToken="%s"/>
+     <bindingRedirect oldVersion="%s" newVersion="%s"/>
+   </dependentAssembly>
+ </assemblyBinding></runtime></configuration>
+ ''' % (source[1].value, tok, oldVersionRange, newVersion))
+    out.close()
+
+def getKeyFile(node, sources):
+    """search for key file"""
+    for file in node.children():
+        if file.name.endswith('.snk'):
+            sources.append(file)
+            return
+
+    # if not found look in included netmodules (first found is used)
+    for file in node.children():
+        if file.name.endswith('.netmodule'):
+            for file2 in file.children():
+                if file2.name.endswith('.snk'):
+                    sources.append(file2)
+                    return
+
+def PublisherPolicy(env, target, **kw):
+    """creates the publisher policy dll, mapping the major.minor.0.0 calls to the
+    major, minor, build, and revision passed in through the dictionary VERSION key"""
+    sources = []
+    # get version and generate .config file
+    version = parseVersion(kw)
+    asm = os.path.splitext(target[0].name)[0]
+    configName = 'policy.%d.%d.%s.%s' % (version[0], version[1], asm, 'config')
+    targ = 'policy.%d.%d.%s' % (version[0], version[1], target[0].name)
+    config = env.Command(configName, [Value(version), Value(asm), target[0]], generatePublisherPolicyConfig)
+    sources.append(config[0])
+
+    # find .snk key
+    getKeyFile(target[0], sources)
+
+    return env.CLIAsmLink(targ, sources, **kw)
+
+def CLIRefs(env, refs, paths = [], **kw):
+    listRefs = []
+    normpaths = [env.Dir(p).abspath for p in paths]
+    normpaths += env['CLIREFPATHS']
+
+    for ref in refs:
+        if not ref.endswith(env['SHLIBSUFFIX']):
+            ref += env['SHLIBSUFFIX']
+        if not ref.startswith(env['SHLIBPREFIX']):
+            ref = env['SHLIBPREFIX'] + ref
+        pathref = detectRef(ref, normpaths, env)
+        if pathref:
+            listRefs.append(pathref)
+
+    return listRefs
+
+def CLIMods(env, refs, paths = [], **kw):
+    listMods = []
+    normpaths = [env.Dir(p).abspath for p in paths]
+    normpaths += env['CLIMODPATHS']
+
+    for ref in refs:
+        if not ref.endswith(env['CLIMODSUFFIX']):
+            ref += env['CLIMODSUFFIX']
+        pathref = detectRef(ref, normpaths, env)
+        if pathref:
+            listMods.append(pathref)
+
+    return listMods
+
+def detectRef(ref, paths, env):
+    """look for existance of file (ref) at one of the paths"""
+    for path in paths:
+        if path.endswith(ref):
+            return path
+        pathref = os.path.join(path, ref)
+        if os.path.isfile(pathref):
+            return pathref
+
+    return ''
+
+def AddToRefPaths(env, files, **kw):
+    # the file name is included in path reference because otherwise checks for that output file
+    # by CLIRefs/CLIMods would fail until after it has been built.  Since SCons makes a pass
+    # before building anything, that file won't be there.  Only after the second pass will it be built
+    ref = env.FindIxes(files, 'SHLIBPREFIX', 'SHLIBSUFFIX').abspath
+    env['CLIREFPATHS'] = [ref] + env['CLIREFPATHS']
+    return 0
+
+def AddToModPaths(env, files, **kw):
+    mod = env.FindIxes(files, 'CLIMODPREFIX', 'CLIMODSUFFIX').abspath
+    env['CLIMODPATHS'] = [mod] + env['CLIMODPATHS']
+    return 0
+
+def cscFlags(target, source, env, for_signature):
+    listCmd = []
+    if (env.has_key('WINEXE')):
+        if (env['WINEXE'] == 1):
+            listCmd.append('-t:winexe')
+    return listCmd
+
+def cscSources(target, source, env, for_signature):
+    listCmd = []
+
+    for s in source:
+        if (str(s).endswith('.cs')):  # do this first since most will be source files
+            listCmd.append(s)
+        elif (str(s).endswith('.resources')):
+            listCmd.append('-resource:%s' % s.get_string(for_signature))
+        elif (str(s).endswith('.snk')):
+            listCmd.append('-keyfile:%s' % s.get_string(for_signature))
+        else:
+            # just treat this as a generic unidentified source file
+            listCmd.append(s)
+
+    return listCmd
+
+def cscSourcesNoResources(target, source, env, for_signature):
+    listCmd = []
+
+    for s in source:
+        if (str(s).endswith('.cs')):  # do this first since most will be source files
+            listCmd.append(s)
+        elif (str(s).endswith('.resources')): # resources cannot be embedded in netmodules
+            pass
+        elif (str(s).endswith('.snk')):
+            listCmd.append('-keyfile:%s' % s.get_string(for_signature))
+        else:
+            # just treat this as a generic unidentified source file
+            listCmd.append(s)
+
+    return listCmd
+
+def cscRefs(target, source, env, for_signature):
+    listCmd = []
+
+    if (env.has_key('ASSEMBLYREFS')):
+        refs = SCons.Util.flatten(env['ASSEMBLYREFS'])
+        for ref in refs:
+            if SCons.Util.is_String(ref):
+                listCmd.append('-reference:%s' % ref)
+            else:
+                listCmd.append('-reference:%s' % ref.abspath)
+
+    return listCmd
+
+def cscMods(target, source, env, for_signature):
+    listCmd = []
+
+    if (env.has_key('NETMODULES')):
+        mods = SCons.Util.flatten(env['NETMODULES'])
+        for mod in mods:
+            listCmd.append('-addmodule:%s' % mod)
+
+    return listCmd
+
+# TODO: this currently does not allow sources to be embedded (-embed flag)
+def alLinkSources(target, source, env, for_signature):
+    listCmd = []
+
+    for s in source:
+        if (str(s).endswith('.snk')):
+            listCmd.append('-keyfile:%s' % s.get_string(for_signature))
+        else:
+            # just treat this as a generic unidentified source file
+            listCmd.append('-link:%s' % s.get_string(for_signature))
+
+    if env.has_key('VERSION'):
+        version = parseVersion(env)
+        listCmd.append('-version:%d.%d.%d.%d' % version)
+
+    return listCmd
+
+def cliLinkSources(target, source, env, for_signature):
+    listCmd = []
+
+    # append source item. if it is a netmodule and has child resources, also append those
+    for s in source:
+        # all source items should go into listCmd
+        listCmd.append('%s' % s.get_string(for_signature))
+
+        if (str(s).endswith('.netmodule')):
+            for child in s.children():
+                if child.name.endswith('.resources'):
+                    listCmd.append('/assemblyresource:%s' % child.get_string(for_signature))
+
+    return listCmd
+
+def add_version(target, source, env):
+    if env.has_key('VERSION'):
+        if SCons.Util.is_String(target[0]):
+            versionfile = target[0] + '_VersionInfo.cs'
+        else:
+            versionfile = target[0].name + '_VersionInfo.cs'
+        source.append(env.Command(versionfile, [Value(getVersionAsmDirective(*parseVersion(env)))], generateVersionId))
+    return (target, source)
+
+# this check is needed because .NET assemblies like to have '.' in the name.
+# scons interprets that as an extension and doesn't append the suffix as a result
+def lib_emitter(target, source, env):
+    newtargets = []
+    for tnode in target:
+        t = tnode.name
+        if not t.endswith(env['SHLIBSUFFIX']):
+            t += env['SHLIBSUFFIX']
+        newtargets.append(t)
+
+    return (newtargets, source)
+
+def add_depends(target, source, env):
+    """Add dependency information before the build order is established"""
+
+    if (env.has_key('NETMODULES')):
+        mods = SCons.Util.flatten(env['NETMODULES'])
+        for mod in mods:
+            # add as dependency
+            for t in target:
+                env.Depends(t, mod)
+
+    if (env.has_key('ASSEMBLYREFS')):
+        refs = SCons.Util.flatten(env['ASSEMBLYREFS'])
+        for ref in refs:
+            # add as dependency
+            for t in target:
+                env.Depends(t, ref)
+
+    return (target, source)
+
+csc_action = SCons.Action.Action('$CSCCOM', '$CSCCOMSTR')
+
+MsCliBuilder = SCons.Builder.Builder(action = '$CSCCOM',
+                                     source_factory = SCons.Node.FS.default_fs.Entry,
+                                     emitter = add_version,
+                                     suffix = '.exe')
+
+csclib_action = SCons.Action.Action('$CSCLIBCOM', '$CSCLIBCOMSTR')
+
+MsCliLibBuilder = SCons.Builder.Builder(action = '$CSCLIBCOM',
+                                        source_factory = SCons.Node.FS.default_fs.Entry,
+                                        emitter = [lib_emitter, add_version, add_depends],
+                                        suffix = '$SHLIBSUFFIX')
+
+cscmod_action = SCons.Action.Action('$CSCMODCOM', '$CSCMODCOMSTR')
+
+MsCliModBuilder = SCons.Builder.Builder(action = '$CSCMODCOM',
+                                        source_factory = SCons.Node.FS.default_fs.Entry,
+                                        emitter = [add_version, add_depends],
+                                        suffix = '$CLIMODSUFFIX')
+
+def module_deps(target, source, env):
+    for s in source:
+        dir = s.dir.srcdir
+        if (dir is not None and dir is not type(None)):
+            for t in target:
+                env.Depends(t,s)
+    return (target, source)
+
+clilink_action = SCons.Action.Action('$CLILINKCOM', '$CLILINKCOMSTR')
+
+MsCliLinkBuilder = SCons.Builder.Builder(action = '$CLILINKCOM',
+                                         source_factory = SCons.Node.FS.default_fs.Entry,
+                                         emitter = [lib_emitter, add_version, module_deps], # don't know the best way yet to get module dependencies added
+                                         suffix = '.dll') #'$SHLIBSUFFIX')
+
+# TODO : This probably needs some more work... it hasn't been used since
+# finding the abilities of the VS 2005 C++ linker for .NET.
+MsCliAsmLinkBuilder = SCons.Builder.Builder(action = '$CLIASMLINKCOM',
+                                            source_factory = SCons.Node.FS.default_fs.Entry,
+                                            suffix = '.dll')
+
+typelib_prefix = 'Interop.'
+
+def typelib_emitter(target, source, env):
+    newtargets = []
+    for tnode in target:
+        t = tnode.name
+        if not t.startswith(typelib_prefix):
+            t = typelib_prefix + t
+        newtargets.append(t)
+
+    return (newtargets, source)
+
+def tlbimpFlags(target, source, env, for_signature):
+    listCmd = []
+
+    basename = os.path.splitext(target[0].name)[0]
+    # strip off typelib_prefix (such as 'Interop.') so it isn't in the namespace
+    if basename.startswith(typelib_prefix):
+        basename = basename[len(typelib_prefix):]
+    listCmd.append('-namespace:%s' % basename)
+
+    listCmd.append('-out:%s' % target[0].tpath)
+
+    for s in source:
+        if (str(s).endswith('.snk')):
+            listCmd.append('-keyfile:%s' % s.get_string(for_signature))
+
+    return listCmd
+
+typelibimp_action = SCons.Action.Action('$TYPELIBIMPCOM', '$TYPELIBIMPCOMSTR')
+
+MsCliTypeLibBuilder = SCons.Builder.Builder(action = '$TYPELIBIMPCOM',
+                                            source_factory = SCons.Node.FS.default_fs.Entry,
+                                            emitter = [typelib_emitter, add_depends],
+                                            suffix = '.dll')
+
+res_action = SCons.Action.Action('$CLIRCCOM', '$CLIRCCOMSTR')
+
+def res_emitter(target, source, env):
+    # prepend NAMESPACE if provided
+    if (env.has_key('NAMESPACE')):
+        newtargets = []
+        for t in target:
+            tname = t.name
+
+            # this is a cheesy way to get rid of '.aspx' in .resx file names
+            idx = tname.find('.aspx.')
+            if idx >= 0:
+                tname = tname[:idx] + tname[idx+5:]
+
+            newtargets.append('%s.%s' % (env['NAMESPACE'], tname))
+        return (newtargets, source)
+    else:
+        return (targets, source)
+
+MsCliResBuilder = SCons.Builder.Builder(action=res_action,
+                                        emitter=res_emitter,
+                                        src_suffix='.resx',
+                                        suffix='.resources',
+                                        src_builder=[],
+                                        source_scanner=SCons.Tool.SourceFileScanner)
+
+SCons.Tool.SourceFileScanner.add_scanner('.resx', SCons.Defaults.CScan)
+
+def generate(env):
+    envpaths = env['ENV']['PATH']
+    env['CLIREFPATHS']  = envpaths.split(os.pathsep)
+    env['CLIMODPATHS']  = []
+    env['ASSEMBLYREFS'] = []
+    env['NETMODULES']   = []
+
+    env['BUILDERS']['CLIProgram'] = MsCliBuilder
+    env['BUILDERS']['CLIAssembly'] = MsCliLibBuilder
+    env['BUILDERS']['CLILibrary'] = MsCliLibBuilder
+    env['BUILDERS']['CLIModule']  = MsCliModBuilder
+    env['BUILDERS']['CLILink']    = MsCliLinkBuilder
+    env['BUILDERS']['CLIAsmLink'] = MsCliAsmLinkBuilder
+    env['BUILDERS']['CLIRes'] = MsCliResBuilder
+    env['BUILDERS']['CLITypeLib'] = MsCliTypeLibBuilder
+
+    env['CSC']          = env.Detect('gmcs') or 'csc'
+    env['_CSCLIBS']     = "${_stripixes('-r:', CILLIBS, '', '-r', '', __env__)}"
+    env['_CSCLIBPATH']  = "${_stripixes('-lib:', CILLIBPATH, '', '-r', '', __env__)}"
+    env['CSCFLAGS']     = SCons.Util.CLVar('-nologo -noconfig')
+    env['_CSCFLAGS']    = cscFlags
+    env['_CSC_SOURCES'] = cscSources
+    env['_CSC_SOURCES_NO_RESOURCES'] = cscSourcesNoResources
+    env['_CSC_REFS']    = cscRefs
+    env['_CSC_MODS']    = cscMods
+    env['CSCCOM']       = '$CSC $CSCFLAGS $_CSCFLAGS -out:${TARGET.abspath} $_CSC_REFS $_CSC_MODS $_CSC_SOURCES'
+    env['CSCLIBCOM']    = '$CSC -t:library $CSCFLAGS $_CSCFLAGS $_CSCLIBPATH $_CSCLIBS -out:${TARGET.abspath} $_CSC_REFS $_CSC_MODS $_CSC_SOURCES'
+    env['CSCMODCOM']    = '$CSC -t:module $CSCFLAGS $_CSCFLAGS -out:${TARGET.abspath} $_CSC_REFS $_CSC_MODS $_CSC_SOURCES_NO_RESOURCES'
+    env['CLIMODPREFIX'] = ''
+    env['CLIMODSUFFIX'] = '.netmodule'
+    env['CSSUFFIX']     = '.cs'
+
+    # this lets us link .netmodules together into a single assembly
+    env['CLILINK']      = 'link'
+    env['CLILINKFLAGS'] = SCons.Util.CLVar('-nologo -ltcg -dll -noentry')
+    env['_CLILINK_SOURCES'] = cliLinkSources
+    env['CLILINKCOM']   = '$CLILINK $CLILINKFLAGS -out:${TARGET.abspath} $_CLILINK_SOURCES' # $SOURCES'
+
+    env['CLIASMLINK']   = 'al'
+    env['CLIASMLINKFLAGS'] = SCons.Util.CLVar('')
+    env['_ASMLINK_SOURCES'] = alLinkSources
+    env['CLIASMLINKCOM'] = '$CLIASMLINK $CLIASMLINKFLAGS -out:${TARGET.abspath} $_ASMLINK_SOURCES'
+
+    env['CLIRC']        = 'resgen'
+    env['CLIRCFLAGS']   = ''
+    env['CLIRCCOM']     = '$CLIRC $CLIRCFLAGS $SOURCES $TARGETS'
+
+    env['TYPELIBIMP']       = 'tlbimp'
+    env['TYPELIBIMPFLAGS'] = SCons.Util.CLVar('-sysarray')
+    env['_TYPELIBIMPFLAGS'] = tlbimpFlags
+    env['TYPELIBIMPCOM']    = '$TYPELIBIMP $SOURCES $TYPELIBIMPFLAGS $_TYPELIBIMPFLAGS'
+
+    SConsEnvironment.CLIRefs = CLIRefs
+    SConsEnvironment.CLIMods = CLIMods
+    SConsEnvironment.AddToRefPaths = AddToRefPaths
+    SConsEnvironment.AddToModPaths = AddToModPaths
+    SConsEnvironment.PublisherPolicy = PublisherPolicy
+
+def exists(env):
+    return env.Detect('csc') or env.Detect('gmcs')
diff --git a/tools/csharp/csharp.xml b/tools/csharp/csharp.xml
new file mode 100644
index 0000000000000000000000000000000000000000..9ecd3802ad60e59efd6aeb697fd695dcef59d081
--- /dev/null
+++ b/tools/csharp/csharp.xml
@@ -0,0 +1,156 @@
+<!--
+__COPYRIGHT__
+
+This file is processed by the bin/SConsDoc.py module.
+See its __doc__ string for a discussion of the format.
+-->
+<tool name="mscs">
+<summary>
+Sets construction variables for the Microsoft CSharp Compiler
+</summary>
+</tool>
+
+<builder name="CLILibrary">
+<summary>
+Builds a .NET assembly (dynamically linkable binary) from a list of sources.
+<example>
+env.CLILibrary('MyAsm', 'MyAsm.cs')
+</example>
+</summary>
+</builder>
+
+<builder name="CLILink">
+<summary>
+Uses Microsoft C++ linker to link netmodules into a single .NET assembly:
+
+<example>
+env.CLILink('Common', ['mod1.netmodule', 'mod2.netmodule'])
+</example>
+</summary>
+</builder>
+
+<builder name="CLIModule">
+<summary>
+Builds a .NET netmodule (statically linkable binary) from a list of sources:
+
+<example>
+env.CLIModule('MyMod', 'MyMod.cs')
+</example>
+</summary>
+</builder>
+
+<builder name="CLIProgram">
+<summary>
+Builds a .NET executable from a list of sources.
+If the $WINEXE value is set, the sources will be compiled as a windows app, rather than a console app:
+
+<example>
+env.Program('MyApp', 'MyApp.cs', WINEXE=1)
+</example>
+</summary>
+</builder>
+
+<builder name="CLIRes">
+<summary>
+Builds a Microsoft binary resource file (extension of .resources) from XML source files.
+If the $NAMESPACE value is set, its value is prepended to the name of the target file:
+
+<example>
+env.CLIRes('app.resx', NAMESPACE='MyCompany.ProductX')
+</example>
+</summary>
+</builder>
+
+<builder name="CLITypeLib">
+<summary>
+Builds a .NET interop assembly that contains converted type definitions found within a COM type library DLL.  Prepends the .NET assembly with 'Interop.':
+
+<example>
+env.CLITypeLib('MyLib', ['MyLib.dll', 'keyfile.snk'])
+</example>
+</summary>
+</builder>
+
+<cvar name="CLILINK">
+<summary>
+The Microsoft C++ linker.
+</summary>
+</cvar>
+
+<cvar name="CLILINKFLAGS">
+<summary>
+General options passed to the Microsoft C++ linker.
+</summary>
+</cvar>
+
+<cvar name="CLILINKCOM">
+<summary>
+The command line used to link .NET netmodules into an assembly.  Any options specified in the $CLILINKFLAGS construction variable is included on this command line.
+</summary>
+</cvar>
+
+<cvar name="CSC">
+<summary>
+The CSharp Compiler.
+</summary>
+</cvar>
+
+<cvar name="CSCFLAGS">
+<summary>
+General options that are passed to the CSharp Compiler.
+</summary>
+</cvar>
+
+<cvar name="CSCCOM">
+<summary>
+The command line used to compile a CSharp source file to a console or windows executable. Any options specified in the $CSCFLAGS is included on this command line.
+</summary>
+</cvar>
+
+<cvar name="CSCLIBCOM">
+<summary>
+The command line used to compile a CSharp source file to a .NET assembly. Any options specified in the $CSCFLAGS is included on this command line.
+</summary>
+</cvar>
+
+<cvar name="CSCMODCOM">
+<summary>
+The command line used to compile a CSharp source file to a .NET netmodule. Any options specified in the $CSCFLAGS is included on this command line.
+</summary>
+</cvar>
+
+<cvar name="CLIRC">
+<summary>
+The Microsoft .NET resource compiler.
+</summary>
+</cvar>
+
+<cvar name="CLIRCFLAGS">
+<summary>
+General options passed to the Microsoft .NET resource compiler.
+</summary>
+</cvar>
+
+<cvar name="CLIRCCOM">
+<summary>
+The command line used to compile XML resource files to a .NET resource binary.  Any options specified in the $CLIRCFLAGS construction variable is included on this command line.
+</summary>
+</cvar>
+
+<cvar name="TYPELIBIMP">
+<summary>
+The Microsoft Type Library Importer.
+</summary>
+</cvar>
+
+<cvar name="TYPELIBIMPFLAGS">
+<summary>
+General options passed to the Microsoft Type Library Importer.
+</summary>
+</cvar>
+
+<cvar name="TYPELIBIMPCOM">
+<summary>
+The command line used to convert type definitions found within a COM type library into equivalent definitions in a .NET assembly.  Any options specified in the $TYPELIBIMPFLAGS construction variable is included on this command line.
+</summary>
+</cvar>
diff --git a/tools/csharp/mono.py b/tools/csharp/mono.py
new file mode 100644
index 0000000000000000000000000000000000000000..5bc203d83b6bbd83d61ab4a48e3a90c8a0da08ab
--- /dev/null
+++ b/tools/csharp/mono.py
@@ -0,0 +1,56 @@
+# -*- mode:python; coding:utf-8; -*-
+
+# Copyright (c) 2009 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#  A tool for processing C# code.
+
+#  This C# Tool for Mono taken from http://www.scons.org/wiki/CsharpBuilder.
+
+import os.path
+import SCons.Builder
+import SCons.Node.FS
+import SCons.Util
+
+csccom = "$CSC $CSCFLAGS -out:${TARGET.abspath} $SOURCES"
+csclibcom = "$CSC -t:library $CSCLIBFLAGS $_CSCLIBPATH $_CSCLIBS -out:${TARGET.abspath} $SOURCES"
+
+McsBuilder = SCons.Builder.Builder(action = '$CSCCOM',
+                                   source_factory = SCons.Node.FS.default_fs.Entry,
+                                   suffix = '.exe')
+
+McsLibBuilder = SCons.Builder.Builder(action = '$CSCLIBCOM',
+                                      source_factory = SCons.Node.FS.default_fs.Entry,
+                                      suffix = '.dll')
+
+def generate(env):
+    env['BUILDERS']['CLIProgram'] = McsBuilder
+    env['BUILDERS']['CLILibrary'] = McsLibBuilder
+    
+    env['CSC']        = 'gmcs'
+    env['_CSCLIBS']    = "${_stripixes('-r:', CILLIBS, '', '-r', '', __env__)}"
+    env['_CSCLIBPATH'] = "${_stripixes('-lib:', CILLIBPATH, '', '-r', '', __env__)}"
+    env['CSCFLAGS']   = SCons.Util.CLVar('')
+    env['CSCCOM']     = SCons.Action.Action(csccom)
+    env['CSCLIBCOM']  = SCons.Action.Action(csclibcom)
+    
+def exists(env):
+    return internal_zip or env.Detect('mcs')