% scons -Q --tree=derived,status [?1034hcc -o f1.o -c -I. f1.c cc -o f2.o -c -I. f2.c cc -o f3.o -c -I. f3.c cc -o prog f1.o f2.o f3.o E = exists R = exists in repository only b = implicit builder B = explicit builder S = side effect P = precious A = always build C = current N = no clean H = no cache [E b ]+-. [E B C ] +-f1.o [E B C ] +-f2.o [E B C ] +-f3.o [E B C ] +-prog [E B C ] +-f1.o [E B C ] +-f2.o [E B C ] +-f3.o