--- a/xpcom/Makefile.in
+++ b/xpcom/Makefile.in
@@ -8,53 +8,13 @@ topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
 GRE_MODULE	= 1
 
-DIRS		= \
-		idl-parser \
-		typelib \
-		string \
-		glue \
-		base \
-		ds \
-		io \
-		components \
-		threads \
-		reflect \
-                system \
-		../chrome \
-		build \
-		$(NULL)
-
-ifeq ($(OS_ARCH),WINNT)
-ifdef MOZ_DEBUG
-DIRS		+= windbgdlg
-endif
-endif
-
-ifdef ENABLE_TESTS
-TOOL_DIRS += \
-	tests \
-	sample \
-	typelib/xpt/tests \
-	$(NULL)
-
-#  Can't build internal xptcall tests that use symbols which are not exported.
-#TOOL_DIRS += \
-#	reflect/xptinfo/tests \
-#	reflect/xptcall/tests \
-#	$(NULL)
-endif
-
 # xpcom-config.h is generated by configure
 SDK_HEADERS	= xpcom-config.h
 
-ifdef DEHYDRA_PATH
-DIRS += analysis
-endif
-
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/analysis/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/base/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/build/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/components/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/ds/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/glue/Makefile.in
+++ b/xpcom/glue/Makefile.in
@@ -8,24 +8,16 @@ topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 include $(srcdir)/objs.mk
 
 EXTRA_DEPS += $(srcdir)/objs.mk
 
-DIRS            = standalone nomozalloc
-
-# On win we build two glue libs - glue linked to crt dlls here and in staticruntime we build
-# a statically linked glue lib.
-ifeq ($(OS_ARCH),WINNT)
-DIRS += staticruntime
-endif
-
 MODULE		= xpcom
 LIBRARY_NAME	= xpcomglue_s
 DIST_INSTALL	= 1
 
 LOCAL_INCLUDES	= \
 		-I$(srcdir)/../build \
 		$(NULL)
 

new file mode 100644
--- /dev/null
+++ b/xpcom/glue/moz.build
@@ -0,0 +1,11 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['standalone', 'nomozalloc']
+
+# On win we build two glue libs - glue linked to crt dlls here and in staticruntime we build
+# a statically linked glue lib.
+if CONFIG['OS_ARCH'] == 'WINNT':
+    DIRS += ['staticruntime']

new file mode 100644
--- /dev/null
+++ b/xpcom/glue/nomozalloc/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/glue/standalone/Makefile.in
+++ b/xpcom/glue/standalone/Makefile.in
@@ -8,22 +8,16 @@ topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 include $(srcdir)/../objs.mk
 
 EXTRA_DEPS += $(srcdir)/../objs.mk
 
-# On win we build two glue libs - glue linked to crt dlls here and in staticruntime we build
-# a statically linked glue lib.
-ifeq ($(OS_ARCH),WINNT)
-DIRS += staticruntime
-endif
-
 MODULE		= xpcom
 LIBRARY_NAME	= xpcomglue
 DIST_INSTALL	= 1
 
 LOCAL_INCLUDES	= \
 	-I$(srcdir)/../../build \
 	$(NULL)
 

new file mode 100644
--- /dev/null
+++ b/xpcom/glue/standalone/moz.build
@@ -0,0 +1,9 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# On win we build two glue libs - glue linked to crt dlls here and in staticruntime we build
+# a statically linked glue lib.
+if CONFIG['OS_ARCH'] == 'WINNT':
+    DIRS += ['staticruntime']

new file mode 100644
--- /dev/null
+++ b/xpcom/glue/standalone/staticruntime/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/glue/staticruntime/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/idl-parser/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/io/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/moz.build
@@ -0,0 +1,38 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += [
+    'idl-parser',
+    'typelib',
+    'string',
+    'glue',
+    'base',
+    'ds',
+    'io',
+    'components',
+    'threads',
+    'reflect',
+    'system',
+    '../chrome',
+    'build',
+]
+
+if CONFIG['OS_ARCH'] == 'WINNT' and CONFIG['MOZ_DEBUG']:
+    DIRS += ['windbgdlg']
+
+TEST_TOOL_DIRS += [
+    'tests',
+    'sample',
+    'typelib/xpt/tests',
+]
+
+#  Can't build internal xptcall tests that use symbols which are not exported.
+#TEST_TOOL_DIRS += [
+#    'reflect/xptinfo/tests',
+#    'reflect/xptcall/tests,
+#]
+
+if CONFIG['DEHYDRA_PATH']:
+    DIRS += ['analysis']

--- a/xpcom/reflect/Makefile.in
+++ b/xpcom/reflect/Makefile.in
@@ -6,12 +6,11 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
-DIRS		= xptinfo xptcall
 
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['xptinfo', 'xptcall']

--- a/xpcom/reflect/xptcall/Makefile.in
+++ b/xpcom/reflect/xptcall/Makefile.in
@@ -6,12 +6,11 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
-DIRS		= public src
 
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['public', 'src']

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/public/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/reflect/xptcall/src/Makefile.in
+++ b/xpcom/reflect/xptcall/src/Makefile.in
@@ -9,19 +9,16 @@ srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
 LIBRARY_NAME	= xptcall
 MOZILLA_INTERNAL_API = 1
 
-DIRS		= md
-
-
 CPPSRCS		= xptcall.cpp
 
 # we don't want the shared lib, but we want to force the creation of a static lib.
 FORCE_STATIC_LIB = 1
 
 
 include $(topsrcdir)/config/rules.mk
 

--- a/xpcom/reflect/xptcall/src/md/Makefile.in
+++ b/xpcom/reflect/xptcall/src/md/Makefile.in
@@ -5,20 +5,10 @@
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-ifeq ($(OS_ARCH),OS2)
-DIRS = os2
-else
-ifeq ($(OS_ARCH),WINNT)
-DIRS = win32
-else
-DIRS = unix
-endif
-endif
-
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/src/md/moz.build
@@ -0,0 +1,13 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+arch = CONFIG['OS_ARCH']
+
+if arch == 'OS2':
+    DIRS += ['os2']
+elif arch == 'WINNT':
+    DIRS += ['win32']
+else:
+    DIRS += ['unix']

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/src/md/os2/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/src/md/test/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/src/md/unix/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/src/md/win32/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/src/moz.build
@@ -0,0 +1,7 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+DIRS += ['md']

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptcall/tests/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/reflect/xptinfo/Makefile.in
+++ b/xpcom/reflect/xptinfo/Makefile.in
@@ -6,12 +6,11 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
-DIRS		= public src
 
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptinfo/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['public', 'src']

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptinfo/public/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptinfo/src/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/reflect/xptinfo/tests/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/sample/Makefile.in
+++ b/xpcom/sample/Makefile.in
@@ -5,19 +5,16 @@
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-# This makefile builds the "program" subdirectory.
-DIRS = program
-
 # MODULE specifies where header files from this Makefile are installed,
 # i.e. dist/include/xpcomsample
 MODULE		= xpcomsample
 
 # XPIDL_MODULE names the .xpt file generated from IDL files
 # i.e. dist/bin/components/xpcomsample.xpt
 XPIDL_MODULE	= xpcomsample
 

new file mode 100644
--- /dev/null
+++ b/xpcom/sample/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['program']

new file mode 100644
--- /dev/null
+++ b/xpcom/sample/program/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/string/Makefile.in
+++ b/xpcom/string/Makefile.in
@@ -6,16 +6,10 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= string
-DIRS		= public src
-
-#ifdef ENABLE_TESTS
-#DIRS		+= \
-#	tests
-#endif
 
 include $(topsrcdir)/config/rules.mk

new file mode 100644
--- /dev/null
+++ b/xpcom/string/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['public', 'src']

new file mode 100644
--- /dev/null
+++ b/xpcom/string/public/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/string/src/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/stub/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/system/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/tests/Makefile.in
+++ b/xpcom/tests/Makefile.in
@@ -1,39 +1,23 @@
-#
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir = @relativesrcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
 FAIL_ON_WARNINGS = 1
 
-DIRS		= \
-  external \
-  component \
-  bug656331_component \
-  component_no_aslr \
-  $(NULL)
-
-ifeq ($(OS_ARCH),WINNT)
-DIRS		+= windows
-endif
-
-ifdef DEHYDRA_PATH
-DIRS += static-checker
-endif
-
 VPATH += $(topsrcdir)/build
 
 CPPSRCS = \
   nsIFileEnumerator.cpp \
   TestCallTemplates.cpp \
   TestINIParser.cpp \
   TestPRIntN.cpp \
   TestRacingServiceManager.cpp \

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/bug656331_component/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/component/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/component_no_aslr/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/external/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/moz.build
@@ -0,0 +1,17 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += [
+    'external',
+    'component',
+    'bug656331_component',
+    'component_no_aslr',
+]
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    DIRS += ['windows']
+
+if CONFIG['DEHYDRA_PATH']:
+    DIRS += ['static-checker']

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/static-checker/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/tests/windows/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/threads/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/typelib/Makefile.in
+++ b/xpcom/typelib/Makefile.in
@@ -6,12 +6,11 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
-DIRS		= xpt xpidl
 
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['xpt', 'xpidl']

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/xpidl/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/xpcom/typelib/xpt/Makefile.in
+++ b/xpcom/typelib/xpt/Makefile.in
@@ -7,12 +7,10 @@ DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
 
-DIRS		= public src tools
-
 include $(topsrcdir)/config/rules.mk
 

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/xpt/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['public', 'src', 'tools']

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/xpt/public/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/xpt/src/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/xpt/tests/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/typelib/xpt/tools/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/xpcom/windbgdlg/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+