btree_dir := btree
btree_src := bt_close.c bt_conv.c bt_debug.c bt_delete.c bt_get.c bt_open.c bt_overflow.c bt_page.c bt_put.c bt_search.c bt_seq.c bt_split.c bt_utils.c
SRCS += $(addprefix $(btree_dir)/,$(btree_src))
