diff --git a/Lib/Makefile.am b/Lib/Makefile.am
new file mode 100644
index 000000000..9b607f4c5
--- /dev/null
+++ b/Lib/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = \
+	DEM \
+	Polygon
diff --git a/Prep/Makefile.am b/Prep/Makefile.am
new file mode 100644
index 000000000..51f8ae2bb
--- /dev/null
+++ b/Prep/Makefile.am
@@ -0,0 +1,5 @@
+SUBDIRS = \
+	DemInfo \
+	DemRaw2ascii \
+	GenAirports \
+	ShapeFile
diff --git a/Utils/Makefile.am b/Utils/Makefile.am
new file mode 100644
index 000000000..5c3f005b0
--- /dev/null
+++ b/Utils/Makefile.am
@@ -0,0 +1,2 @@
+SUBDIRS = \
+	Makedir