bmake error on Mandrive: "bmake: no system rules (sys.mk)"

I'm trying to use bmake to build OS161 on Mandriva. When I try to run bmake, I get the following error: bmake: no system rules (sys.mk) I get the same error, even when I run bmake -m /usr/local/share/mk/sys.mk I've checked, and the path I listed above exists, but regardless of what path I give it, even if I give it a garbage path, I get the same error. This happens no matter what directory I run bmake in, so it's definitely not an OS161 problem. Does anybody know how to fix this?