doc: add default values of install variables

The variables DESTDIR and prefix are used with "make install"
to copy the files in $DESTDIR$prefix.
Their default values will be shown when calling "make help".

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/build-sdk-quick.txt b/doc/build-sdk-quick.txt
index 967ff09..57356d3 100644 (file)
--- a/doc/build-sdk-quick.txt
+++ b/doc/build-sdk-quick.txt
@@ -20,8 +20,8 @@ Build variables
        V         verbose
        D         debug dependencies
        O         build directory (default: build/ - install T= default: ./)
-       DESTDIR   staging install directory
-       prefix    root install directory
+       DESTDIR   staging install directory (default: empty)
+       prefix    root install directory (default: /usr/local)
        T         target template - used with config or install
                        format: <arch-machine-execenv-toolchain>
                        templates in config/defconfig_*