[FFmpeg-cvslog] doc/build_system: Document GEN, text taken from the webpage

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Wed May 27 12:23:01 2015 +0200| [1cf87e1680423370d26d4e20d4591a6561aa12b9] | committer: Michael Niedermayer

doc/build_system: Document GEN, text taken from the webpage

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1cf87e1680423370d26d4e20d4591a6561aa12b9
---

 doc/build_system.txt |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/build_system.txt b/doc/build_system.txt
index 20242b1..1efe6b5 100644
--- a/doc/build_system.txt
+++ b/doc/build_system.txt
@@ -16,6 +16,9 @@ DESTDIR
     Destination directory for the install targets, useful to prepare packages
     or install FFmpeg in cross-environments.
 
+GEN
+    Set to ‘1’ to generate the missing or mismatched references.
+
 Makefile targets:
 
 all