diff --git a/configure.ac b/configure.ac
index 48a7cebe..2af37832 100644
--- a/configure.ac
+++ b/configure.ac
@@ -371,6 +371,7 @@ AC_CONFIG_FILES([ \
 	simgear/screen/Makefile \
 	simgear/serial/Makefile \
 	simgear/sky/Makefile \
+	simgear/sky/clouds3d/Makefile \
 	simgear/threads/Makefile \
 	simgear/timing/Makefile \
 	simgear/xgl/Makefile \
diff --git a/simgear/scene/sky/Makefile.am b/simgear/scene/sky/Makefile.am
index 36695897..ad13cbe9 100644
--- a/simgear/scene/sky/Makefile.am
+++ b/simgear/scene/sky/Makefile.am
@@ -1,5 +1,7 @@
 includedir = @includedir@/sky
 
+SUBDIRS = clouds3d
+
 lib_LIBRARIES = libsgsky.a
 
 include_HEADERS = \