diff --git a/lib/hdb/Makefile.am b/lib/hdb/Makefile.am
index d9610bf71..7793fc0ed 100644
--- a/lib/hdb/Makefile.am
+++ b/lib/hdb/Makefile.am
@@ -4,6 +4,26 @@ AUTOMAKE_OPTIONS = no-dependencies foreign
 
 INCLUDES = -I$(top_builddir)/include
 
+SUFFIXES = .x
+
+INCLUDES = -I../asn1 -I$(srcdir)/../asn1
+
+BUILT_SOURCES = asn1_Key.c asn1_Event.c asn1_HDBFlags.c asn1_hdb_entry.c
+
+foo = asn1_Key.x asn1_Event.x asn1_HDBFlags.x asn1_hdb_entry.x
+
+CLEANFILES = $(BUILT_SOURCES) $(foo) hdb_asn1.h asn1_files
+
+
 lib_LIBRARIES = libhdb.a
 
-libhdb_a_SOURCES = hdb.c db.c ndbm.c
+libhdb_a_SOURCES = hdb.c db.c ndbm.c $(BUILT_SOURCES)
+
+$(foo) hdb_asn1.h: asn1_files
+
+asn1_files: ../asn1/asn1_compile $(srcdir)/hdb.asn1
+	../asn1/asn1_compile $(srcdir)/hdb.asn1 hdb_asn1
+
+$(libhdb_a_OBJECTS): hdb_asn1.h
+.x.c:
+	@cmp -s $< $@ 2> /dev/null || cp $< $@