diff --git a/config/x86_64-linux/config.mk b/config/x86_64-linux/config.mk
index f0d0dfa..4293b37 100644
--- a/config/x86_64-linux/config.mk
+++ b/config/x86_64-linux/config.mk
@@ -9,7 +9,7 @@ CONFIG_SRCS = $(CONFIG_DEFAULT_SRCS)
 
 # extensions: dynamic loading
 DYNLOAD_SRCS = \
-	Python/dynload_shlib.c \
+	core/Python/dynload_shlib.c \
 
 
 # extensions: desired subsets
diff --git a/config/x86_64-midipix/config.mk b/config/x86_64-midipix/config.mk
index 72d86cc..e9c672d 100644
--- a/config/x86_64-midipix/config.mk
+++ b/config/x86_64-midipix/config.mk
@@ -9,7 +9,7 @@ CONFIG_SRCS = $(CONFIG_DEFAULT_SRCS)
 
 # extensions: dynamic loading
 DYNLOAD_SRCS = \
-	Python/dynload_shlib.c \
+	core/Python/dynload_shlib.c \
 
 
 # extensions: desired subsets
diff --git a/profiles/pyexts/subsets.mk b/profiles/pyexts/subsets.mk
index 3d256b3..112cfc5 100644
--- a/profiles/pyexts/subsets.mk
+++ b/profiles/pyexts/subsets.mk
@@ -1,16 +1,16 @@
 # extension subsets: built-in defaults
 CONFIG_DEFAULT_SRCS = \
-	Modules/_codecsmodule.c \
-	Modules/_sre.c \
-	Modules/_weakref.c \
-	Modules/errnomodule.c \
-	Modules/posixmodule.c \
-	Modules/pwdmodule.c \
-	Modules/signalmodule.c \
-	Modules/symtablemodule.c \
-	Modules/threadmodule.c \
-	Modules/xxsubtype.c \
-	Modules/zipimport.c \
+	core/Modules/_codecsmodule.c \
+	core/Modules/_sre.c \
+	core/Modules/_weakref.c \
+	core/Modules/errnomodule.c \
+	core/Modules/posixmodule.c \
+	core/Modules/pwdmodule.c \
+	core/Modules/signalmodule.c \
+	core/Modules/symtablemodule.c \
+	core/Modules/threadmodule.c \
+	core/Modules/xxsubtype.c \
+	core/Modules/zipimport.c \
 
 # extension subsets: shared
 PYEXT_SUBSET_SHARED_ANYOS_CORE = \
diff --git a/project/common.mk b/project/common.mk
index 3f2a355..ed5797e 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -1,144 +1,126 @@
-Modules/config.lo:	build/config.c $(ALL_HEADERS) host.tag tree.tag config.tag
+core/Modules/config.lo:	build/config.c $(ALL_HEADERS) host.tag tree.tag config.tag
 			$(CC) -c -o $@ $< $(CFLAGS_SHARED)
 
-Modules/config.o:	build/config.c $(ALL_HEADERS) host.tag tree.tag config.tag
+core/Modules/config.o:	build/config.c $(ALL_HEADERS) host.tag tree.tag config.tag
 			$(CC) -c -o $@ $< $(CFLAGS_STATIC)
 
-Modules/%.lo:	$(SOURCE_DIR)/Modules/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
+core/%.lo:	$(SOURCE_DIR)/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
 		$(CC) -c -o $@ $< $(CFLAGS_SHARED)
 
-Modules/%.o:	$(SOURCE_DIR)/Modules/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
-		$(CC) -c -o $@ $< $(CFLAGS_STATIC)
-
-Objects/%.lo:	$(SOURCE_DIR)/Objects/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
-		$(CC) -c -o $@ $< $(CFLAGS_SHARED)
-
-Objects/%.o:	$(SOURCE_DIR)/Objects/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
-		$(CC) -c -o $@ $< $(CFLAGS_STATIC)
-
-Parser/%.lo:	$(SOURCE_DIR)/Parser/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
-		$(CC) -c -o $@ $< $(CFLAGS_SHARED)
-
-Parser/%.o:	$(SOURCE_DIR)/Parser/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
-		$(CC) -c -o $@ $< $(CFLAGS_STATIC)
-
-Python/%.lo:	$(SOURCE_DIR)/Python/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
-		$(CC) -c -o $@ $< $(CFLAGS_SHARED)
-
-Python/%.o:	$(SOURCE_DIR)/Python/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
+core/%.o:	$(SOURCE_DIR)/%.c $(ALL_HEADERS) host.tag tree.tag config.tag
 		$(CC) -c -o $@ $< $(CFLAGS_STATIC)
 
 
 MODULE_SRCS = \
-	Modules/config.c \
-	Modules/gcmodule.c \
-	Modules/getbuildinfo.c \
-	Modules/getpath.c \
-	Modules/main.c \
+	core/Modules/config.c \
+	core/Modules/gcmodule.c \
+	core/Modules/getbuildinfo.c \
+	core/Modules/getpath.c \
+	core/Modules/main.c \
 
 OBJECT_SRCS = \
-	Objects/abstract.c \
-	Objects/boolobject.c \
-	Objects/bufferobject.c \
-	Objects/bytearrayobject.c \
-	Objects/bytes_methods.c \
-	Objects/capsule.c \
-	Objects/cellobject.c \
-	Objects/classobject.c \
-	Objects/cobject.c \
-	Objects/codeobject.c \
-	Objects/complexobject.c \
-	Objects/descrobject.c \
-	Objects/dictobject.c \
-	Objects/enumobject.c \
-	Objects/exceptions.c \
-	Objects/fileobject.c \
-	Objects/floatobject.c \
-	Objects/frameobject.c \
-	Objects/funcobject.c \
-	Objects/genobject.c \
-	Objects/intobject.c \
-	Objects/iterobject.c \
-	Objects/listobject.c \
-	Objects/longobject.c \
-	Objects/memoryobject.c \
-	Objects/methodobject.c \
-	Objects/moduleobject.c \
-	Objects/object.c \
-	Objects/obmalloc.c \
-	Objects/rangeobject.c \
-	Objects/setobject.c \
-	Objects/sliceobject.c \
-	Objects/stringobject.c \
-	Objects/structseq.c \
-	Objects/tupleobject.c \
-	Objects/typeobject.c \
-	Objects/unicodeobject.c \
-	Objects/unicodectype.c \
-	Objects/weakrefobject.c \
+	core/Objects/abstract.c \
+	core/Objects/boolobject.c \
+	core/Objects/bufferobject.c \
+	core/Objects/bytearrayobject.c \
+	core/Objects/bytes_methods.c \
+	core/Objects/capsule.c \
+	core/Objects/cellobject.c \
+	core/Objects/classobject.c \
+	core/Objects/cobject.c \
+	core/Objects/codeobject.c \
+	core/Objects/complexobject.c \
+	core/Objects/descrobject.c \
+	core/Objects/dictobject.c \
+	core/Objects/enumobject.c \
+	core/Objects/exceptions.c \
+	core/Objects/fileobject.c \
+	core/Objects/floatobject.c \
+	core/Objects/frameobject.c \
+	core/Objects/funcobject.c \
+	core/Objects/genobject.c \
+	core/Objects/intobject.c \
+	core/Objects/iterobject.c \
+	core/Objects/listobject.c \
+	core/Objects/longobject.c \
+	core/Objects/memoryobject.c \
+	core/Objects/methodobject.c \
+	core/Objects/moduleobject.c \
+	core/Objects/object.c \
+	core/Objects/obmalloc.c \
+	core/Objects/rangeobject.c \
+	core/Objects/setobject.c \
+	core/Objects/sliceobject.c \
+	core/Objects/stringobject.c \
+	core/Objects/structseq.c \
+	core/Objects/tupleobject.c \
+	core/Objects/typeobject.c \
+	core/Objects/unicodeobject.c \
+	core/Objects/unicodectype.c \
+	core/Objects/weakrefobject.c \
 
 PARSER_SRCS = \
-	Parser/acceler.c \
-	Parser/bitset.c \
-	Parser/firstsets.c \
-	Parser/grammar.c \
-	Parser/grammar1.c \
-	Parser/listnode.c \
-	Parser/metagrammar.c \
-	Parser/myreadline.c \
-	Parser/node.c \
-	Parser/parser.c \
-	Parser/parsetok.c \
-	Parser/pgen.c \
-	Parser/tokenizer.c \
+	core/Parser/acceler.c \
+	core/Parser/bitset.c \
+	core/Parser/firstsets.c \
+	core/Parser/grammar.c \
+	core/Parser/grammar1.c \
+	core/Parser/listnode.c \
+	core/Parser/metagrammar.c \
+	core/Parser/myreadline.c \
+	core/Parser/node.c \
+	core/Parser/parser.c \
+	core/Parser/parsetok.c \
+	core/Parser/pgen.c \
+	core/Parser/tokenizer.c \
 
 PYTHON_SRCS = \
-	Python/Python-ast.c \
-	Python/_warnings.c \
-	Python/asdl.c \
-	Python/ast.c \
-	Python/bltinmodule.c \
-	Python/ceval.c \
-	Python/codecs.c \
-	Python/compile.c \
-	Python/dtoa.c \
-	Python/errors.c \
-	Python/formatter_string.c \
-	Python/formatter_unicode.c \
-	Python/frozen.c \
-	Python/frozenmain.c \
-	Python/future.c \
-	Python/getargs.c \
-	Python/getcompiler.c \
-	Python/getcopyright.c \
-	Python/getopt.c \
-	Python/getplatform.c \
-	Python/getversion.c \
-	Python/graminit.c \
-	Python/import.c \
-	Python/importdl.c \
-	Python/marshal.c \
-	Python/modsupport.c \
-	Python/mysnprintf.c \
-	Python/mystrtoul.c \
-	Python/peephole.c \
-	Python/pyarena.c \
-	Python/pyctype.c \
-	Python/pyfpe.c \
-	Python/pymath.c \
-	Python/pystate.c \
-	Python/pystrcmp.c \
-	Python/pystrtod.c \
-	Python/pythonrun.c \
-	Python/random.c \
-	Python/structmember.c \
-	Python/symtable.c \
-	Python/sysmodule.c \
-	Python/thread.c \
-	Python/traceback.c \
+	core/Python/Python-ast.c \
+	core/Python/_warnings.c \
+	core/Python/asdl.c \
+	core/Python/ast.c \
+	core/Python/bltinmodule.c \
+	core/Python/ceval.c \
+	core/Python/codecs.c \
+	core/Python/compile.c \
+	core/Python/dtoa.c \
+	core/Python/errors.c \
+	core/Python/formatter_string.c \
+	core/Python/formatter_unicode.c \
+	core/Python/frozen.c \
+	core/Python/frozenmain.c \
+	core/Python/future.c \
+	core/Python/getargs.c \
+	core/Python/getcompiler.c \
+	core/Python/getcopyright.c \
+	core/Python/getopt.c \
+	core/Python/getplatform.c \
+	core/Python/getversion.c \
+	core/Python/graminit.c \
+	core/Python/import.c \
+	core/Python/importdl.c \
+	core/Python/marshal.c \
+	core/Python/modsupport.c \
+	core/Python/mysnprintf.c \
+	core/Python/mystrtoul.c \
+	core/Python/peephole.c \
+	core/Python/pyarena.c \
+	core/Python/pyctype.c \
+	core/Python/pyfpe.c \
+	core/Python/pymath.c \
+	core/Python/pystate.c \
+	core/Python/pystrcmp.c \
+	core/Python/pystrtod.c \
+	core/Python/pythonrun.c \
+	core/Python/random.c \
+	core/Python/structmember.c \
+	core/Python/symtable.c \
+	core/Python/sysmodule.c \
+	core/Python/thread.c \
+	core/Python/traceback.c \
 
 APP_SRCS = \
-	Modules/python.c \
+	core/Modules/python.c \
 
 COMMON_SRCS = \
 	$(CONFIG_SRCS)     \
diff --git a/project/pycompile.mk b/project/pycompile.mk
index 1cf9333..3c4b811 100644
--- a/project/pycompile.mk
+++ b/project/pycompile.mk
@@ -29,16 +29,17 @@ PYCOMPILE_LDFLAGS	+= -lreadline -lm -lutil -lpthread
 $(PYCOMPILE_DIR)/tree.tag:
 		mkdir -p $(PYCOMPILE_DIR)/bin
 		mkdir -p $(PYCOMPILE_DIR)/lib
+		mkdir -p $(PYCOMPILE_DIR)/core
+		mkdir -p $(PYCOMPILE_DIR)/core/Modules
+		mkdir -p $(PYCOMPILE_DIR)/core/Objects
+		mkdir -p $(PYCOMPILE_DIR)/core/Parser
+		mkdir -p $(PYCOMPILE_DIR)/core/Python
 		mkdir -p $(PYCOMPILE_DIR)/pyext
 		mkdir -p $(PYCOMPILE_DIR)/pyext/obj
 		mkdir -p $(PYCOMPILE_DIR)/lib/$(NICKNAME)
 		mkdir -p $(PYCOMPILE_DIR)/lib/$(NICKNAME)/encodings
 		mkdir -p $(PYCOMPILE_DIR)/lib/$(NICKNAME)/lib-dynload
 		mkdir -p $(PYCOMPILE_DIR)/build
-		mkdir -p $(PYCOMPILE_DIR)/Modules
-		mkdir -p $(PYCOMPILE_DIR)/Objects
-		mkdir -p $(PYCOMPILE_DIR)/Parser
-		mkdir -p $(PYCOMPILE_DIR)/Python
 		touch $(PYCOMPILE_DIR)/tree.tag
 
 ifeq ($(PYCOMPILE_CFGSTEP),)
@@ -61,19 +62,11 @@ endif
 $(PYCOMPILE_DIR)/build/config.c:	$(PYCOMPILE_DIR)/config.tag
 $(PYCOMPILE_DIR)/build/pyconfig.h:	$(PYCOMPILE_DIR)/config.tag
 
-$(PYCOMPILE_DIR)/Modules/config.o:	$(PYCOMPILE_DIR)/build/config.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
+$(PYCOMPILE_DIR)/core/Modules/config.o:	$(PYCOMPILE_DIR)/build/config.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
 					$(NATIVE_CC) -c -o $@ $< $(PYCOMPILE_CFLAGS)
 
-$(PYCOMPILE_DIR)/Modules/%.o:	$(SOURCE_DIR)/Modules/%.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
+$(PYCOMPILE_DIR)/core/%.o:	$(SOURCE_DIR)/%.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
 				$(NATIVE_CC) -c -o $@ $< $(PYCOMPILE_CFLAGS)
-
-$(PYCOMPILE_DIR)/Objects/%.o:	$(SOURCE_DIR)/Objects/%.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
-				$(NATIVE_CC) -c -o $@ $< $(PYCOMPILE_CFLAGS)
-
-$(PYCOMPILE_DIR)/Parser/%.o:	$(SOURCE_DIR)/Parser/%.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
-				$(NATIVE_CC) -c -o $@ $< $(PYCOMPILE_CFLAGS)
-
-$(PYCOMPILE_DIR)/Python/%.o:	$(SOURCE_DIR)/Python/%.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
 				$(NATIVE_CC) -c -o $@ $< $(PYCOMPILE_CFLAGS)
 
 $(PYCOMPILE_DIR)/pyext/obj/%.o:	$(SOURCE_DIR)/Modules/%.c $(ALL_HEADERS) $(PYCOMPILE_TAGS)
@@ -92,23 +85,16 @@ PYCOMPILE_PYEXT_SRCS = \
 	$(PYEXT_UNICODEDATA_SRCS)	\
 
 
-PYCOMPILE_APP_OBJS	= $(PYCOMPILE_APP_SRCS:Modules/%.c=$(PYCOMPILE_DIR)/Modules/%.o)
-PYCOMPILE_CONFIG_OBJS	= $(PYCOMPILE_CONFIG_SRCS:Modules/%.c=$(PYCOMPILE_DIR)/Modules/%.o)
-PYCOMPILE_MODULE_OBJS	= $(MODULE_SRCS:Modules/%.c=$(PYCOMPILE_DIR)/Modules/%.o)
-PYCOMPILE_OBJECT_OBJS	= $(OBJECT_SRCS:Objects/%.c=$(PYCOMPILE_DIR)/Objects/%.o)
-PYCOMPILE_PARSER_OBJS	= $(PARSER_SRCS:Parser/%.c=$(PYCOMPILE_DIR)/Parser/%.o)
-PYCOMPILE_PYTHON_OBJS	= $(PYTHON_SRCS:Python/%.c=$(PYCOMPILE_DIR)/Python/%.o)
-PYCOMPILE_PYEXT_OBJS	= $(PYCOMPILE_PYEXT_SRCS:%.c=$(PYCOMPILE_DIR)/%.o)
-
-PYCOMPILE_OBJS = \
-	$(PYCOMPILE_APP_OBJS)		\
-	$(PYCOMPILE_CONFIG_OBJS)	\
-	$(PYCOMPILE_MODULE_OBJS)	\
-	$(PYCOMPILE_OBJECT_OBJS)	\
-	$(PYCOMPILE_PARSER_OBJS)	\
-	$(PYCOMPILE_PYTHON_OBJS)	\
-	$(PYCOMPILE_PYEXT_OBJS)		\
+PYCOMPILE_SRCS =                    \
+	$(PYCOMPILE_APP_SRCS)       \
+	$(PYCOMPILE_CONFIG_SRCS)    \
+	$(PYCOMPILE_PYEXT_SRCS)     \
+	$(MODULE_SRCS)              \
+	$(OBJECT_SRCS)              \
+	$(PARSER_SRCS)              \
+	$(PYTHON_SRCS)
 
+PYCOMPILE_OBJS = $(PYCOMPILE_SRCS:%.c=$(PYCOMPILE_DIR)/%.o)
 
 ifeq ($(PYCOMPILE_CFGSTEP),)
 
diff --git a/project/tree.mk b/project/tree.mk
index 136318e..8239397 100644
--- a/project/tree.mk
+++ b/project/tree.mk
@@ -1,9 +1,9 @@
 tree.tag:
-		mkdir -p tools
-		mkdir -p Modules
-		mkdir -p Objects
-		mkdir -p Parser
-		mkdir -p Python
+		mkdir -p core
+		mkdir -p core/Modules
+		mkdir -p core/Objects
+		mkdir -p core/Parser
+		mkdir -p core/Python
 		mkdir -p pyext
 		mkdir -p pyext/obj
 		mkdir -p pyext/obj/cjkcodecs
@@ -11,4 +11,5 @@ tree.tag:
 		mkdir -p pyext/obj/_io
 		mkdir -p pyext/obj/_multiprocessing
 		mkdir -p pyext/obj/_sqlite
+		mkdir -p tools
 		touch tree.tag