diff --git a/src/Makefile.am b/src/Makefile.am
index 3d013eb..9b0affa 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,5 @@
 # Process this file with automake to produce Makefile.in
 
-NULL =
 SUBDIRS =
 DIST_SUBDIRS =
 BUILT_SOURCES =
@@ -19,121 +18,23 @@
 
 lib_LTLIBRARIES = libharfbuzz.la
 
+include Makefile.sources
+
 HBCFLAGS =
 HBLIBS =
 HBNONPCLIBS =
 HBDEPS =
-HBSOURCES =  \
-	hb-atomic-private.hh \
-	hb-blob.cc \
-	hb-buffer-deserialize-json.hh \
-	hb-buffer-deserialize-text.hh \
-	hb-buffer-private.hh \
-	hb-buffer-serialize.cc \
-	hb-buffer.cc \
-	hb-cache-private.hh \
-	hb-common.cc \
-	hb-face-private.hh \
-	hb-face.cc \
-	hb-font-private.hh \
-	hb-font.cc \
-	hb-mutex-private.hh \
-	hb-object-private.hh \
-	hb-open-file-private.hh \
-	hb-open-type-private.hh \
-	hb-ot-cmap-table.hh \
-	hb-ot-glyf-table.hh \
-	hb-ot-head-table.hh \
-	hb-ot-hhea-table.hh \
-	hb-ot-hmtx-table.hh \
-	hb-ot-maxp-table.hh \
-	hb-ot-name-table.hh \
-	hb-ot-os2-table.hh \
-	hb-ot-tag.cc \
-	hb-private.hh \
-	hb-set-private.hh \
-	hb-set.cc \
-	hb-shape.cc \
-	hb-shape-plan-private.hh \
-	hb-shape-plan.cc \
-	hb-shaper-list.hh \
-	hb-shaper-impl-private.hh \
-	hb-shaper-private.hh \
-	hb-shaper.cc \
-	hb-unicode-private.hh \
-	hb-unicode.cc \
-	hb-utf-private.hh \
-	hb-warning.cc \
-	$(NULL)
-HBHEADERS = \
-	hb.h \
-	hb-blob.h \
-	hb-buffer.h \
-	hb-common.h \
-	hb-deprecated.h \
-	hb-face.h \
-	hb-font.h \
-	hb-set.h \
-	hb-shape.h \
-	hb-shape-plan.h \
-	hb-unicode.h \
-	$(NULL)
-HBNODISTHEADERS = \
-	hb-version.h \
-	$(NULL)
+HBSOURCES =  $(HB_BASE_sources)
+HBHEADERS = $(HB_BASE_headers)
+HBNODISTHEADERS = $(HB_NODIST_headers)
 
 if HAVE_OT
-HBSOURCES += \
-	hb-ot-font.cc \
-	hb-ot-layout.cc \
-	hb-ot-layout-common-private.hh \
-	hb-ot-layout-gdef-table.hh \
-	hb-ot-layout-gpos-table.hh \
-	hb-ot-layout-gsubgpos-private.hh \
-	hb-ot-layout-gsub-table.hh \
-	hb-ot-layout-jstf-table.hh \
-	hb-ot-layout-private.hh \
-	hb-ot-map.cc \
-	hb-ot-map-private.hh \
-	hb-ot-shape.cc \
-	hb-ot-shape-complex-arabic.cc \
-	hb-ot-shape-complex-arabic-fallback.hh \
-	hb-ot-shape-complex-arabic-private.hh \
-	hb-ot-shape-complex-arabic-table.hh \
-	hb-ot-shape-complex-arabic-win1256.hh \
-	hb-ot-shape-complex-default.cc \
-	hb-ot-shape-complex-hangul.cc \
-	hb-ot-shape-complex-hebrew.cc \
-	hb-ot-shape-complex-indic.cc \
-	hb-ot-shape-complex-indic-machine.hh \
-	hb-ot-shape-complex-indic-private.hh \
-	hb-ot-shape-complex-indic-table.cc \
-	hb-ot-shape-complex-myanmar.cc \
-	hb-ot-shape-complex-myanmar-machine.hh \
-	hb-ot-shape-complex-thai.cc \
-	hb-ot-shape-complex-tibetan.cc \
-	hb-ot-shape-complex-use.cc \
-	hb-ot-shape-complex-use-machine.hh \
-	hb-ot-shape-complex-use-private.hh \
-	hb-ot-shape-complex-use-table.cc \
-	hb-ot-shape-complex-private.hh \
-	hb-ot-shape-normalize-private.hh \
-	hb-ot-shape-normalize.cc \
-	hb-ot-shape-fallback-private.hh \
-	hb-ot-shape-fallback.cc \
-	hb-ot-shape-private.hh \
-	$(NULL)
-HBHEADERS += \
-	hb-ot.h \
-	hb-ot-font.h \
-	hb-ot-layout.h \
-	hb-ot-shape.h \
-	hb-ot-tag.h \
-	$(NULL)
+HBSOURCES += $(HB_OT_sources)
+HBHEADERS += $(HB_OT_headers)
 endif
 
 if HAVE_FALLBACK
-HBSOURCES += hb-fallback-shape.cc
+HBSOURCES += $(HB_FALLBACK_sources)
 endif
 
 if HAVE_PTHREAD
@@ -145,8 +46,8 @@
 HBCFLAGS += $(GLIB_CFLAGS)
 HBLIBS   += $(GLIB_LIBS)
 HBDEPS   += $(GLIB_DEPS)
-HBSOURCES += hb-glib.cc
-HBHEADERS += hb-glib.h
+HBSOURCES += $(HB_GLIB_sources)
+HBHEADERS += $(HB_GLIB_headers)
 endif
 
 if HAVE_FREETYPE
@@ -158,37 +59,37 @@
 # fine but pkg-config 0.26 as shipped in Ubuntu 14.04 crashes.  Remove
 # in a year or two, or otherwise work around it...
 #HBDEPS   += $(FREETYPE_DEPS)
-HBSOURCES += hb-ft.cc
-HBHEADERS += hb-ft.h
+HBSOURCES += $(HB_FT_sources)
+HBHEADERS += $(HB_FT_headers)
 endif
 
 if HAVE_GRAPHITE2
 HBCFLAGS += $(GRAPHITE2_CFLAGS)
 HBLIBS   += $(GRAPHITE2_LIBS)
 HBDEPS   += $(GRAPHITE2_DEPS)
-HBSOURCES += hb-graphite2.cc
-HBHEADERS += hb-graphite2.h
+HBSOURCES += $(HB_GRAPHITE2_sources)
+HBHEADERS += $(HB_GRAPHITE2_headers)
 endif
 
 if HAVE_UNISCRIBE
 HBCFLAGS += $(UNISCRIBE_CFLAGS)
 HBNONPCLIBS += $(UNISCRIBE_LIBS)
-HBSOURCES += hb-uniscribe.cc
-HBHEADERS += hb-uniscribe.h
+HBSOURCES += $(HB_UNISCRIBE_sources)
+HBHEADERS += $(HB_UNISCRIBE_headers)
 endif
 
 if HAVE_CORETEXT
 HBCFLAGS += $(CORETEXT_CFLAGS)
 HBNONPCLIBS += $(CORETEXT_LIBS)
-HBSOURCES += hb-coretext.cc
-HBHEADERS += hb-coretext.h
+HBSOURCES += $(HB_CORETEXT_sources)
+HBHEADERS += $(HB_CORETEXT_headers)
 endif
 
 if HAVE_UCDN
 SUBDIRS += hb-ucdn
 HBCFLAGS += -I$(srcdir)/hb-ucdn
 HBLIBS   += hb-ucdn/libhb-ucdn.la
-HBSOURCES += hb-ucdn.cc
+HBSOURCES += $(HB_UCDN_sources)
 endif
 DIST_SUBDIRS += hb-ucdn
 
@@ -239,33 +140,33 @@
 
 if HAVE_ICU
 lib_LTLIBRARIES += libharfbuzz-icu.la
-libharfbuzz_icu_la_SOURCES = hb-icu.cc
+libharfbuzz_icu_la_SOURCES = $(HB_ICU_sources)
 libharfbuzz_icu_la_CPPFLAGS = $(ICU_CFLAGS)
 libharfbuzz_icu_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(HB_LIBTOOL_VERSION_INFO) -no-undefined
 libharfbuzz_icu_la_LIBADD = $(ICU_LIBS) libharfbuzz.la
-pkginclude_HEADERS += hb-icu.h
+pkginclude_HEADERS += $(HB_ICU_headers)
 pkgconfig_DATA += harfbuzz-icu.pc
 endif
 EXTRA_DIST += harfbuzz-icu.pc.in
 
 if HAVE_GOBJECT
 lib_LTLIBRARIES += libharfbuzz-gobject.la
-libharfbuzz_gobject_la_SOURCES = hb-gobject-structs.cc
-nodist_libharfbuzz_gobject_la_SOURCES = hb-gobject-enums.cc
+libharfbuzz_gobject_la_SOURCES = $(HB_GOBJECT_sources)
+nodist_libharfbuzz_gobject_la_SOURCES = $(HB_GOBJECT_ENUM_sources)
 libharfbuzz_gobject_la_CPPFLAGS = $(GOBJECT_CFLAGS)
 libharfbuzz_gobject_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(HB_LIBTOOL_VERSION_INFO) -no-undefined
 libharfbuzz_gobject_la_LIBADD = $(GOBJECT_LIBS) libharfbuzz.la
-pkginclude_HEADERS += hb-gobject.h hb-gobject-structs.h
-nodist_pkginclude_HEADERS += hb-gobject-enums.h
+pkginclude_HEADERS += $(HB_GOBJECT_headers)
+nodist_pkginclude_HEADERS += $(HB_GOBJECT_ENUM_headers)
 pkgconfig_DATA += harfbuzz-gobject.pc
 
 BUILT_SOURCES += \
-	hb-gobject-enums.cc \
-	hb-gobject-enums.h \
+	$(HB_GOBJECT_ENUM_sources) \
+	$(HB_GOBJECT_ENUM_headers) \
 	$(NULL)
 DISTCLEANFILES += \
-	hb-gobject-enums.cc \
-	hb-gobject-enums.h \
+	$(HB_GOBJECT_ENUM_sources) \
+	$(HB_GOBJECT_ENUM_headers) \
 	$(NULL)
 hb-gobject-enums.%: hb-gobject-enums.%.tmpl $(HBHEADERS)
 	$(AM_V_GEN) $(GLIB_MKENUMS) \
@@ -437,10 +338,10 @@
 	$(HBHEADERS) \
 	$(HBNODISTHEADERS) \
 	$(HBSOURCES) \
-	hb-gobject-enums.cc \
-	hb-gobject-enums.h \
-	hb-gobject-structs.cc \
-	hb-gobject-structs.h \
+	$(HB_GOBJECT_ENUM_sources) \
+	$(HB_GOBJECT_ENUM_headers) \
+	$(HB_GOBJECT_sources) \
+	$(HB_GOBJECT_STRUCTS_headers) \
 	$(NULL)
 
 girdir = $(datadir)/gir-1.0
diff --git a/src/Makefile.sources b/src/Makefile.sources
new file mode 100644
index 0000000..769b69dc
--- /dev/null
+++ b/src/Makefile.sources
@@ -0,0 +1,147 @@
+NULL =
+
+# Base and default-included sources and headers
+
+HB_BASE_sources = \
+	hb-atomic-private.hh \
+	hb-blob.cc \
+	hb-buffer-deserialize-json.hh \
+	hb-buffer-deserialize-text.hh \
+	hb-buffer-private.hh \
+	hb-buffer-serialize.cc \
+	hb-buffer.cc \
+	hb-cache-private.hh \
+	hb-common.cc \
+	hb-face-private.hh \
+	hb-face.cc \
+	hb-font-private.hh \
+	hb-font.cc \
+	hb-mutex-private.hh \
+	hb-object-private.hh \
+	hb-open-file-private.hh \
+	hb-open-type-private.hh \
+	hb-ot-cmap-table.hh \
+	hb-ot-glyf-table.hh \
+	hb-ot-head-table.hh \
+	hb-ot-hhea-table.hh \
+	hb-ot-hmtx-table.hh \
+	hb-ot-maxp-table.hh \
+	hb-ot-name-table.hh \
+	hb-ot-os2-table.hh \
+	hb-ot-tag.cc \
+	hb-private.hh \
+	hb-set-private.hh \
+	hb-set.cc \
+	hb-shape.cc \
+	hb-shape-plan-private.hh \
+	hb-shape-plan.cc \
+	hb-shaper-list.hh \
+	hb-shaper-impl-private.hh \
+	hb-shaper-private.hh \
+	hb-shaper.cc \
+	hb-unicode-private.hh \
+	hb-unicode.cc \
+	hb-utf-private.hh \
+	hb-warning.cc \
+	$(NULL)
+
+HB_BASE_headers = \
+	hb.h \
+	hb-blob.h \
+	hb-buffer.h \
+	hb-common.h \
+	hb-deprecated.h \
+	hb-face.h \
+	hb-font.h \
+	hb-set.h \
+	hb-shape.h \
+	hb-shape-plan.h \
+	hb-unicode.h \
+	$(NULL)
+
+HB_NODIST_headers = \
+	hb-version.h \
+	$(NULL)
+
+HB_FALLBACK_sources = hb-fallback-shape.cc
+
+HB_OT_sources = \
+	hb-ot-font.cc \
+	hb-ot-layout.cc \
+	hb-ot-layout-common-private.hh \
+	hb-ot-layout-gdef-table.hh \
+	hb-ot-layout-gpos-table.hh \
+	hb-ot-layout-gsubgpos-private.hh \
+	hb-ot-layout-gsub-table.hh \
+	hb-ot-layout-jstf-table.hh \
+	hb-ot-layout-private.hh \
+	hb-ot-map.cc \
+	hb-ot-map-private.hh \
+	hb-ot-shape.cc \
+	hb-ot-shape-complex-arabic.cc \
+	hb-ot-shape-complex-arabic-fallback.hh \
+	hb-ot-shape-complex-arabic-private.hh \
+	hb-ot-shape-complex-arabic-table.hh \
+	hb-ot-shape-complex-arabic-win1256.hh \
+	hb-ot-shape-complex-default.cc \
+	hb-ot-shape-complex-hangul.cc \
+	hb-ot-shape-complex-hebrew.cc \
+	hb-ot-shape-complex-indic.cc \
+	hb-ot-shape-complex-indic-machine.hh \
+	hb-ot-shape-complex-indic-private.hh \
+	hb-ot-shape-complex-indic-table.cc \
+	hb-ot-shape-complex-myanmar.cc \
+	hb-ot-shape-complex-myanmar-machine.hh \
+	hb-ot-shape-complex-thai.cc \
+	hb-ot-shape-complex-tibetan.cc \
+	hb-ot-shape-complex-use.cc \
+	hb-ot-shape-complex-use-machine.hh \
+	hb-ot-shape-complex-use-private.hh \
+	hb-ot-shape-complex-use-table.cc \
+	hb-ot-shape-complex-private.hh \
+	hb-ot-shape-normalize-private.hh \
+	hb-ot-shape-normalize.cc \
+	hb-ot-shape-fallback-private.hh \
+	hb-ot-shape-fallback.cc \
+	hb-ot-shape-private.hh \
+	$(NULL)
+
+HB_OT_headers = \
+	hb-ot.h \
+	hb-ot-font.h \
+	hb-ot-layout.h \
+	hb-ot-shape.h \
+	hb-ot-tag.h \
+	$(NULL)
+
+# Optional Sources and Headers with external deps
+
+HB_FT_sources = hb-ft.cc
+HB_FT_headers = hb-ft.h
+
+HB_GLIB_sources = hb-glib.cc
+HB_GLIB_headers = hb-glib.h
+
+HB_GRAPHITE2_sources = hb-graphite2.cc
+HB_GRAPHITE2_headers = hb-graphite2.h
+
+# System-dependent sources and headers
+
+HB_CORETEXT_sources = hb-coretext.cc
+HB_CORETEXT_headers = hb-coretext.h
+
+HB_UNISCRIBE_sources = hb-uniscribe.cc
+HB_UNISCRIBE_headers = hb-uniscribe.h
+
+# Additional supplemental sources
+HB_UCDN_sources  = hb-ucdn.cc
+
+# Sources for libharfbuzz-gobject and libharfbuzz-icu
+HB_ICU_sources = hb-icu.cc
+HB_ICU_headers = hb-icu.h
+
+HB_GOBJECT_sources = hb-gobject-structs.cc
+HB_GOBJECT_STRUCTS_headers = hb-gobject-structs.h
+HB_GOBJECT_headers = hb-gobject.h $(HB_GOBJECT_STRUCTS_headers)
+HB_GOBJECT_ENUM_sources = hb-gobject-enums.cc
+HB_GOBJECT_ENUM_headers = hb-gobject-enums.h
diff --git a/src/hb-ucdn/Makefile.am b/src/hb-ucdn/Makefile.am
index 0670b5c..73b5502 100644
--- a/src/hb-ucdn/Makefile.am
+++ b/src/hb-ucdn/Makefile.am
@@ -2,11 +2,9 @@
 
 noinst_LTLIBRARIES = libhb-ucdn.la
 
+include Makefile.sources
 
-libhb_ucdn_la_SOURCES = \
-	ucdn.h \
-	ucdn.c \
-	unicodedata_db.h
+libhb_ucdn_la_SOURCES = $(LIBHB_UCDN_sources)
 libhb_ucdn_la_CPPFLAGS = \
 	-I$(top_srcdir) \
 	-I$(top_srcdir)/src \
diff --git a/src/hb-ucdn/Makefile.sources b/src/hb-ucdn/Makefile.sources
new file mode 100644
index 0000000..d5f87b2
--- /dev/null
+++ b/src/hb-ucdn/Makefile.sources
@@ -0,0 +1,4 @@
+LIBHB_UCDN_sources = \
+	ucdn.h \
+	ucdn.c \
+	unicodedata_db.h