diff --git a/admin/scons/BuilderGCH.py b/admin/scons/BuilderGCH.py
deleted file mode 100644
index a8705885f..000000000
--- a/admin/scons/BuilderGCH.py
+++ /dev/null
@@ -1,109 +0,0 @@
-# coding: utf-8
-##
-## BuilderGCH.py  -  SCons builder for gcc's precompiled headers
-##
-
-#  Copyright (C)      scons.org/wiki/GchBuilder
-#    2006,            Tim Blechmann
-#    2008,            Hermann Vosseler <Ichthyostega@web.de>
-#
-#  This library is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License as
-#  published by the Free Software Foundation; either version 2 of
-#  the License, or (at your option) any later version.
-#####################################################################
-
-# history: 8/2008 adapted for Lumiera build system
-#                 changed to accept a list of precompiled header defs
-
-# TODO: WIP-remove these comments when port to Python 3.x is DONE
-# types.py does not contain ListType in Python 3.x
-# # Why do we require ListType?
-# To do something like
-#    if type(item) is ListType:
-#        ....
-# But types.py does not have ListType anymore
-#    if isinstance(item, list):
-#from types import ListType
-
-import SCons.Action
-import SCons.Builder
-import SCons.Scanner.C
-import SCons.Util
-import SCons.Script
-
-SCons.Script.EnsureSConsVersion(0,96,92)
-
-GchAction = SCons.Action.Action('$GCHCOM', '$GCHCOMSTR')
-GchShAction = SCons.Action.Action('$GCHSHCOM', '$GCHSHCOMSTR')
-
-def gen_suffix(env, sources):
-    return sources[0].get_suffix() + env['GCHSUFFIX']
-
-
-GchShBuilder = SCons.Builder.Builder(action = GchShAction,
-                                     source_scanner = SCons.Scanner.C.CScanner(),
-                                     suffix = gen_suffix)
-
-GchBuilder = SCons.Builder.Builder(action = GchAction,
-                                   source_scanner = SCons.Scanner.C.CScanner(),
-                                   suffix = gen_suffix)
-
-def setup_dependency(target,source,env, key):
-    scanner = SCons.Scanner.C.CScanner()
-    path = scanner.path(env)
-    deps = scanner(source[0], env, path)
-
-    if key in env and env[key]:
-        for header in env[key]:
-            header_path = header.path.strip('.gch')
-            if header_path in [x.path for x in deps]:
-                print("Precompiled header(%s) %s  \t <--- %s" % (key,header_path,source[0]))
-                env.Depends(target, header)
-
-
-def static_pch_emitter(target,source,env):
-    SCons.Defaults.StaticObjectEmitter( target, source, env )
-    setup_dependency(target,source,env, key='GCH')
-    return (target, source)
-
-def shared_pch_emitter(target,source,env):
-    SCons.Defaults.SharedObjectEmitter( target, source, env )
-    setup_dependency(target,source,env, key='GCH-sh')
-    return (target, source)
-
-
-def generate(env):
-    """ Add builders and construction variables for the Gch builder.
-    """
-    env.Append(BUILDERS = {
-        'gch': env.Builder(
-        action = GchAction,
-        target_factory = env.fs.File,
-        ),
-        'gchsh': env.Builder(
-        action = GchShAction,
-        target_factory = env.fs.File,
-        ),
-        })
-    
-    try:
-        bld   = env['BUILDERS']['GCH']
-        bldsh = env['BUILDERS']['GCH-sh']
-    except KeyError:
-        bld = GchBuilder
-        bldsh = GchShBuilder
-        env['BUILDERS']['PrecompiledHeader'] = bld
-        env['BUILDERS']['PrecompiledHeaderShared'] = bldsh
-    
-    env['GCHCOM']     = '$CXX -o $TARGET -x c++-header -c $CXXFLAGS $_CCCOMCOM $SOURCE'
-    env['GCHSHCOM']   = '$CXX -o $TARGET -x c++-header -c $SHCXXFLAGS $_CCCOMCOM $SOURCE'
-    env['GCHSUFFIX']  = '.gch'
-    
-    for suffix in SCons.Util.Split('.c .C .cc .cxx .cpp .c++'):
-        env['BUILDERS']['StaticObject'].add_emitter( suffix, static_pch_emitter )
-        env['BUILDERS']['SharedObject'].add_emitter( suffix, shared_pch_emitter )
-
-
-def exists(env):
-    return env.Detect('g++')