This is xnu-10002.1.13. See this file in:
export MakeInc_cmd=${SRCROOT}/makedefs/MakeInc.cmd
export MakeInc_def=${SRCROOT}/makedefs/MakeInc.def
export MakeInc_rule=${SRCROOT}/makedefs/MakeInc.rule
export MakeInc_dir=${SRCROOT}/makedefs/MakeInc.dir

include $(MakeInc_cmd)
include $(MakeInc_def)

EXPORT_ONLY_FILES =	\
			entropy.h \
			random.h

EXPORT_MI_DIR = prng

# Export our headers
EXPORT_MI_LIST = ${EXPORT_ONLY_FILES}

INSTALL_MI_DIR = prng

INSTALL_MI_LIST = $(empty)

# Don't install in non-local, though
INSTALL_KF_MI_LIST = $(empty)

include $(MakeInc_rule)
include $(MakeInc_dir)