-basic_SUBDIRS := jay mcs class
-net_1_1_bootstrap_SUBDIRS := jay mcs class ilasm tools
-net_2_0_bootstrap_SUBDIRS := class
-net_2_0_SUBDIRS := jay gmcs class nunit20 tests errors tools
+basic_SUBDIRS := build jay mcs class
+net_1_1_bootstrap_SUBDIRS := build jay mcs class ilasm tools
+net_2_0_bootstrap_SUBDIRS := build class ilasm tools
+net_2_0_SUBDIRS := build jay gmcs class nunit20 ilasm tests errors tools