1libapi-y += fd/ 2libapi-y += fs/ 3libapi-y += cpu.o 4libapi-y += debug.o 5libapi-y += str_error_r.o 6 7$(OUTPUT)str_error_r.o: ../str_error_r.c FORCE 8 $(call rule_mkdir) 9 $(call if_changed_dep,cc_o_c) 10