diff --git a/FL/makefile.inc b/FL/makefile.inc
index 9f13d7f..6e821ed 100644
--- a/FL/makefile.inc
+++ b/FL/makefile.inc
@@ -1,17 +1,17 @@
 # -*- mode: makefile; -*-
 
-FL_SRCS= \
-   FL/Fl_Scalepack.C \
-   FL/Fl_Arc_Dial.C \
-   FL/Fl_Text_Edit_Window.C \
-   FL/Boxtypes.C \
+FL/.sources:
+	@ echo "FL_SRCS=\\" > FL/.sources
+	@ git ls-files 'FL/*.C' | tr '\n' ' ' >> FL/.sources
+	@ git ls-files 'FL/*.fl' | tr '\n' ' ' >> FL/.sources
 
-FL_OBJS := $(FL_SRCS:.C=.o)
+include FL/.sources
+
+FL_SRCS:=$(FL_SRCS:.fl=.C)
+FL_OBJS:=$(FL_SRCS:.C=.o)
 
 all: FL/libfl_widgets.a
 
-# $(OBJS): Makefile
-
 FL/libfl_widgets.a: $(FL_OBJS)
 	@ ar rcs $@ $(FL_OBJS)
 
diff --git a/Mixer/makefile.inc b/Mixer/makefile.inc
index bcce5ba..976f070 100644
--- a/Mixer/makefile.inc
+++ b/Mixer/makefile.inc
@@ -1,12 +1,16 @@
 # -*- mode: makefile; -*-
 
-Mixer_SRCS= \
-Mixer/DPM.C \
-Mixer/Mixer_Strip.C \
-Mixer/Panner.C \
-Mixer/Mixer.C \
+Mixer/.sources:
+	@ echo "Mixer_SRCS=\\" > Mixer/.sources
+	@ git ls-files 'Mixer/*.C' | tr '\n' ' ' >> Mixer/.sources
+	@ git ls-files 'Mixer/*.fl' | tr '\n' ' ' >> Mixer/.sources
 
-Mixer_OBJS := $(Mixer_SRCS:.C=.o)
+include Mixer/.sources
+
+Mixer_SRCS += util/debug.C
+
+Mixer_SRCS:=$(Mixer_SRCS:.fl=.C)
+Mixer_OBJS:=$(Mixer_SRCS:.C=.o)
 
 Mixer_LIBS := $(FLTK_LIBS)
 
diff --git a/Timeline/makefile.inc b/Timeline/makefile.inc
index 9374b0d..1902939 100644
--- a/Timeline/makefile.inc
+++ b/Timeline/makefile.inc
@@ -2,55 +2,18 @@
 
 Timeline_VERSION := 0.5.0
 
-Timeline_SRCS= \
-Timeline/Annotation_Region.C \
-Timeline/Audio_Region.C \
-Timeline/Audio_Sequence.C \
-Timeline/Control_Point.C \
-Timeline/Control_Sequence.C \
-Timeline/Fl_Menu_Settings.C \
-Timeline/LASH.C \
-Timeline/LASH_Client.C \
-Timeline/Loggable.C \
-Timeline/Project.C \
-Timeline/Sequence.C \
-Timeline/Sequence_Point.C \
-Timeline/Sequence_Region.C \
-Timeline/Sequence_Widget.C \
-Timeline/TLE.C \
-Timeline/Tempo_Point.C \
-Timeline/Tempo_Sequence.C \
-Timeline/Time_Point.C \
-Timeline/Time_Sequence.C \
-Timeline/Timeline.C \
-Timeline/Track.C \
-Timeline/Transport.C \
-Timeline/Waveform.C \
-Timeline/main.C \
-util/debug.C \
-
-Timeline_SRCS+=\
-Timeline/Engine/Audio_File.C \
-Timeline/Engine/Audio_File_SF.C \
-Timeline/Engine/Audio_Region.C \
-Timeline/Engine/Audio_Sequence.C \
-Timeline/Engine/Disk_Stream.C \
-Timeline/Engine/Engine.C \
-Timeline/Engine/Peaks.C \
-Timeline/Engine/Playback_DS.C \
-Timeline/Engine/Port.C \
-Timeline/Engine/Record_DS.C \
-Timeline/Engine/Timeline.C \
-Timeline/Engine/Track.C \
-Timeline/Engine/dsp.C \
+Timeline/.sources:
+	@ echo "Timeline_SRCS=\\" > Timeline/.sources
+	@ git ls-files 'Timeline/*.C' | tr '\n' ' ' >> Timeline/.sources
+	@ git ls-files 'Timeline/*.fl' | tr '\n' ' ' >> Timeline/.sources
 
+include Timeline/.sources
 
+Timeline_SRCS += util/debug.C
 
+Timeline_SRCS:=$(Timeline_SRCS:.fl=.C)
 Timeline_OBJS:=$(Timeline_SRCS:.C=.o)
 
-# $(Timeline_OBJS): Makefile
-# $(Timeline_OBJS): make.conf
-
 Timeline_LIBS := $(FLTK_LIBS) $(JACK_LIBS) $(SNDFILE_LIBS) $(LASH_LIBS)
 
 Timeline/timeline: $(Timeline_OBJS) FL