Documentation/ptp/Makefile - kernel/msm-4.9 - Gitiles

 # List of programs to build
 hostprogs-y := testptp

 # Tell kbuild to always build the programs
 always := $(hostprogs-y)

 HOSTCFLAGS_testptp.o += -I$(objtree)/usr/include
 HOSTLOADLIBES_testptp := -lrt
	# List of programs to build
	hostprogs-y := testptp

	# Tell kbuild to always build the programs
	always := $(hostprogs-y)

	HOSTCFLAGS_testptp.o += -I$(objtree)/usr/include
	HOSTLOADLIBES_testptp := -lrt