1Basic build
2	make config T=x86_64-native-linuxapp-gcc && make
3Build commands
4	config           get configuration from target template (T=)
5	all              same as build (default rule)
6	build            build in a configured directory
7	clean            remove files but keep configuration
8	install T=       configure, build and install a target in DESTDIR
9	install          install optionally staged in DESTDIR
10	examples         build examples for given targets (T=)
11	examples_clean   clean examples for given targets (T=)
12Build variables
13	EXTRA_CPPFLAGS   preprocessor options
14	EXTRA_CFLAGS     compiler options
15	EXTRA_LDFLAGS    linker options
16	EXTRA_LDLIBS     linker library options
17	RTE_KERNELDIR    linux headers path
18	RTE_DEVEL_BUILD  stricter options (default: y in git tree)
19	CROSS     toolchain prefix
20	V         verbose
21	D         debug dependencies
22	O         build directory (default: build/ - install T= default: ./)
23	DESTDIR   staging install directory
24	prefix    root install directory
25	T         target template - used with config or install
26			format: <arch-machine-execenv-toolchain>
27			templates in config/defconfig_*
28