+ @echo 'Environment variables:'
+ @echo ' O=<abspath> - Use <abspath> as object directory'
+ @echo ' V="" - Quiet build (default)'
+ @echo ' V=1 - Brief build (show defines, ld flags)'
+ @echo ' V=2 - Very verbose build'
+ @echo ' CROSS_COMPILE= - Override CROSS_COMPILER_PREFIX from .config'
+ @echo ' ARCH= - Use given arch for config targets'
+ @echo ' SHELL= - Shell to use for make'
+ @echo ' BUILD_CFLAGS= - extra CFLAGS for compiling host binaries'
+ @echo ' BUILD_LDFLAGS= - extra LDFLAGS for linking host binaries'
+ @echo ' CONFIG_SHELL= - Shell to use for menuconfig'
+ @echo
+ @echo ' PREFIX= - Prepended prefix'
+ @echo ' RUNTIME_PREFIX= - Prefix for the libdir containing shared objects'
+ @echo ' (usually "/")'
+ @echo ' DEVEL_PREFIX= - Prefix for the libdir containing static objects'
+ @echo ' and the include dir (usually "/usr")'
+ @echo ' MULTILIB_DIR= - Directory component for libraries (default "lib").'
+ @echo ' UCLIBC_EXTRA_CFLAGS - extra CFLAGS for compiling uClibc'
+ @echo ' UCLIBC_EXTRA_CPPFLAGS - extra CPPFLAGS for compiling uClibc'
+