Drop ${PARAM} from CPPFLAGS, add it to the HOSTED_C rule. Use the NORMAL_C_C rule for building parma.o.  Put -nostdinc upfront in INCLUDES.
Drop ${PARAM} from CPPFLAGS, add it to the HOSTED_C rule.
Use the NORMAL_C_C rule for building parma.o.  Put -nostdinc upfront in
INCLUDES.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars