add #include branch for compilation with Berkeley DB
diff --git a/Modules/dbmmodule.c b/Modules/dbmmodule.c
index d05a1bd..f9ea7d0 100644
--- a/Modules/dbmmodule.c
+++ b/Modules/dbmmodule.c
@@ -21,6 +21,9 @@
 #elif defined(HAVE_GDBM_NDBM_H)
 #include <gdbm/ndbm.h>
 static char *which_dbm = "GNU gdbm";
+#elif defined(HAVE_BERKDB_H)
+#include <db.h>
+static char *which_dbm = "Berkeley DB";
 #else
 #error "No ndbm.h available!"
 #endif