If only BB_DPKG was enabled in Config.h, busybox would not build; it'd say:
[oweals/busybox.git] / procps /
drwxr-xr-x   ..
-rw-r--r-- 2096 free.c
-rw-r--r-- 6279 kill.c
-rw-r--r-- 7045 ps.c
-rw-r--r-- 1482 renice.c
-rw-r--r-- 2488 uptime.c