Found on Ubuntu forums here
Modify the makefile under build: crunch mode the $? to the left as shown.
@echo "Building valgrind compatible binary..."
$(CC) $? $(VCFLAGS) $(LFS) -o crunch
@echo "valgrind --leak-check=yes crunch ..."
@echo "Building binary..."
$(CC) $? $(CFLAGS) $(LFS) -o $@
Also note that crunch default install is /pentest/passwords/crunch you may want to change the location in the make file to suit.