--- a/layout/Makefile.in
+++ b/layout/Makefile.in
@@ -7,52 +7,9 @@ DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= layout
 
-PARALLEL_DIRS = \
-		style \
-		base \
-		generic \
-		forms \
-		tables \
-		svg \
-		xul/base/public \
-		xul/base/src \
-		ipc \
-		mathml \
-		$(NULL)
-
-ifdef NS_PRINTING
-PARALLEL_DIRS += printing
-endif
-
-ifdef MOZ_XUL
-PARALLEL_DIRS += xul/tree xul/grid
-endif
-
-PARALLEL_DIRS += inspector/public inspector/src
-ifdef ENABLE_TESTS
-PARALLEL_DIRS += inspector/tests inspector/tests/chrome
-endif
-
-DIRS           += build
-DIRS           += media
-
-ifdef ENABLE_TESTS
-PARALLEL_DIRS += \
-  mathml/tests \
-  xul/test \
-  xul/base/test \
-  $(NULL)
-
-TOOL_DIRS      += tools/reftest reftests/fonts reftests/fonts/mplus
-
-ifdef MOZ_DEBUG
-DIRS            += tools/layout-debug
-endif
-endif
-
 include $(topsrcdir)/config/rules.mk

--- a/layout/base/Makefile.in
+++ b/layout/base/Makefile.in
@@ -5,18 +5,16 @@
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-TEST_DIRS += tests
-
 MODULE		= layout
 XPIDL_MODULE	= layout_base
 GRE_MODULE	= 1
 LIBRARY_NAME	= gkbase_s
 LIBXUL_LIBRARY	= 1
 ifndef _MSC_VER
 FAIL_ON_WARNINGS = 1
 endif # !_MSC_VER

new file mode 100644
--- /dev/null
+++ b/layout/base/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/.
+
+TEST_DIRS += ['tests']

--- a/layout/base/tests/Makefile.in
+++ b/layout/base/tests/Makefile.in
@@ -6,24 +6,16 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir	= @relativesrcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-PARALLEL_DIRS += \
-  chrome \
-  $(NULL)
-
-TOOL_DIRS := \
-  cpp-tests \
-  $(NULL)
-
 MOCHITEST_FILES =	\
 		border_radius_hit_testing_iframe.html \
 		test_preserve3d_sorting_hit_testing.html \
 		preserve3d_sorting_hit_testing_iframe.html \
 		test_image_layers.html \
 		image_rgrg-256x256.png \
 		image_rrgg-256x256.png \
 		bug369950-subframe.xml \

new file mode 100644
--- /dev/null
+++ b/layout/base/tests/chrome/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/layout/base/tests/cpp-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/layout/base/tests/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/.
+
+TEST_DIRS += ['chrome']
+TEST_TOOL_DIRS += ['cpp-tests']

new file mode 100644
--- /dev/null
+++ b/layout/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/.
+

--- a/layout/forms/Makefile.in
+++ b/layout/forms/Makefile.in
@@ -5,20 +5,16 @@
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS = $(NULL)
-
-TEST_DIRS += test
-
 MODULE		= layout
 XPIDL_MODULE	= layout_forms
 LIBRARY_NAME	= gkforms_s
 LIBXUL_LIBRARY	= 1
 ifndef _MSC_VER
 FAIL_ON_WARNINGS = 1
 endif # !_MSC_VER
 

new file mode 100644
--- /dev/null
+++ b/layout/forms/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/.
+
+TEST_DIRS += ['test']

new file mode 100644
--- /dev/null
+++ b/layout/forms/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/.
+

--- a/layout/generic/Makefile.in
+++ b/layout/generic/Makefile.in
@@ -4,18 +4,16 @@
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-TEST_DIRS += test
-
 MODULE		= layout
 LIBRARY_NAME	= gkgeneric_s
 LIBXUL_LIBRARY	= 1
 ifndef _MSC_VER
 FAIL_ON_WARNINGS = 1
 endif # !_MSC_VER
 
 EXPORTS		= \

new file mode 100644
--- /dev/null
+++ b/layout/generic/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/.
+
+TEST_DIRS += ['test']

new file mode 100644
--- /dev/null
+++ b/layout/generic/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/layout/inspector/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/layout/inspector/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/layout/inspector/tests/chrome/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/layout/inspector/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/layout/ipc/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/layout/mathml/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/layout/mathml/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/layout/media/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/layout/moz.build
@@ -0,0 +1,46 @@
+# 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/.
+
+PARALLEL_DIRS += [
+    'style',
+    'base',
+    'generic',
+    'forms',
+    'tables',
+    'svg',
+    'xul/base/public',
+    'xul/base/src',
+    'ipc',
+    'mathml',
+    'inspector/public',
+    'inspector/src',
+]
+
+if CONFIG['NS_PRINTING']:
+    PARALLEL_DIRS += ['printing']
+
+if CONFIG['MOZ_XUL']:
+    PARALLEL_DIRS += ['xul/tree', 'xul/grid']
+
+if CONFIG['ENABLE_TESTS']:
+    PARALLEL_DIRS += [
+        'inspector/tests',
+        'inspector/tests/chrome',
+        'mathml/tests',
+        'xul/test',
+        'xul/base/test',
+    ]
+
+TEST_TOOL_DIRS += [
+    'tools/reftest',
+    'reftests/fonts',
+    'reftests/fonts/mplus',
+]
+
+DIRS += ['build', 'media']
+
+if CONFIG['MOZ_DEBUG']:
+    TEST_DIRS += ['tools/layout-debug']
+

new file mode 100644
--- /dev/null
+++ b/layout/printing/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/layout/reftests/fonts/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/layout/reftests/fonts/mplus/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/layout/style/Makefile.in
+++ b/layout/style/Makefile.in
@@ -4,22 +4,16 @@
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS		= xbl-marquee
-
-ifdef ENABLE_TESTS
-TOOL_DIRS	= test
-endif
-
 MODULE		= layout
 LIBRARY_NAME	= gkstyle_s
 LIBXUL_LIBRARY	= 1
 ifndef _MSC_VER
 FAIL_ON_WARNINGS = 1
 endif # !_MSC_VER
 
 ifdef GNU_CC

new file mode 100644
--- /dev/null
+++ b/layout/style/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 += ['xbl-marquee']
+TEST_TOOL_DIRS += ['test']

--- a/layout/style/test/Makefile.in
+++ b/layout/style/test/Makefile.in
@@ -8,19 +8,16 @@ topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir  = @relativesrcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= layout
 
-DIRS +=		chrome \
-		$(NULL)
-
 HOST_CPPSRCS	= \
 		ListCSSProperties.cpp \
 		$(NULL)
 
 HOST_SIMPLE_PROGRAMS	= $(addprefix host_, $(HOST_CPPSRCS:.cpp=$(HOST_BIN_SUFFIX)))
 
 # ParseCSS.cpp used to be built as a test program, but it was not
 # being used for anything, and recent changes to the CSS loader have

new file mode 100644
--- /dev/null
+++ b/layout/style/test/chrome/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/layout/style/test/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/.
+
+TEST_DIRS += ['chrome']

new file mode 100644
--- /dev/null
+++ b/layout/style/xbl-marquee/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/layout/svg/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/layout/tables/Makefile.in
+++ b/layout/tables/Makefile.in
@@ -36,19 +36,16 @@ CPPSRCS		= \
 		nsTableRowFrame.cpp \
 		nsTableRowGroupFrame.cpp \
 		nsTablePainter.cpp \
 		$(NULL)
 
 # we don't want the shared lib, but we want to force the creation of a static lib.
 FORCE_STATIC_LIB = 1
 
-TEST_DIRS += test
-
-
 include $(topsrcdir)/config/rules.mk
 
 DEFINES         += -DDEBUG_TABLE_STRATEGY_off -D_IMPL_NS_LAYOUT
 
 LOCAL_INCLUDES	= \
 		-I$(srcdir)/../base \
 		-I$(srcdir)/../generic \
 		-I$(srcdir)/../style \

new file mode 100644
--- /dev/null
+++ b/layout/tables/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/.
+
+TEST_DIRS += ['test']

new file mode 100644
--- /dev/null
+++ b/layout/tables/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/.
+

--- a/layout/tools/layout-debug/Makefile.in
+++ b/layout/tools/layout-debug/Makefile.in
@@ -7,12 +7,10 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE = layout_debug
-DIRS = src ui
-TEST_DIRS = tests
 
 include $(topsrcdir)/config/rules.mk

new file mode 100644
--- /dev/null
+++ b/layout/tools/layout-debug/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 += ['src', 'ui']
+TEST_DIRS += ['tests']

new file mode 100644
--- /dev/null
+++ b/layout/tools/layout-debug/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/layout/tools/layout-debug/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/layout/tools/layout-debug/ui/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/layout/tools/reftest/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/layout/xul/base/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/layout/xul/base/src/Makefile.in
+++ b/layout/xul/base/src/Makefile.in
@@ -1,9 +1,8 @@
-#
 # 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@

new file mode 100644
--- /dev/null
+++ b/layout/xul/base/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/layout/xul/base/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/layout/xul/grid/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/layout/xul/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/layout/xul/tree/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/.
+