--- a/src/Makefile
+++ b/src/Makefile
@@ -21 +21 @@
-obj-$(CONFIG_BTRFS_FS) := btrfs.o
+obj-m := btrfs.o
@@ -35 +35,2 @@
-btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
+btrfs-y += acl.o
+ccflags-y += -DCONFIG_BTRFS_FS_POSIX_ACL