ref-manual: Updated the EXTRA_OEMAKE variable description.

Provided information about the new default "".

(From yocto-docs rev: 75ab9805614fc9501191eef0000c7a9214765392)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index b26f6f73f7..3e0c151415 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3926,6 +3926,12 @@
 <!--                <para role="glossdeffirst"><imagedata fileref="figures/define-generic.png" /> -->
                     Additional GNU <filename>make</filename> options.
                 </para>
+
+                <para>
+                    Because the <filename>EXTRA_OEMAKE</filename> defaults to
+                    "", you need to set the variable to specify any required
+                    GNU options.
+                </para>
             </glossdef>
         </glossentry>