[Android] Makefile: 7z sanity check

[Edward Wang]

vlc-ports/android | branch: master | Edward Wang <edward.c.wang at compdigitec.com> | Fri Aug  9 20:45:26 2013 -0400| [9937816b82842187a764a27f9555c6052f85b0fa] | committer: Edward Wang

Makefile: 7z sanity check

And close #9100

> http://git.videolan.org/gitweb.cgi/vlc-ports/android.git/?a=commit;h=9937816b82842187a764a27f9555c6052f85b0fa
---

 Makefile |    1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 67c99ca..2780bb8 100644
--- a/Makefile
+++ b/Makefile
@@ -134,6 +134,7 @@ vlc-sdk.7z: .sdk
 	7z a $@ vlc-sdk/
 
 .sdk:
+	@command -v 7z >/dev/null 2>&1 || { echo >&2 "Please install 7z to create SDK packages. Aborting."; exit 1; }
 	mkdir -p vlc-sdk/libs
 	cd vlc-android; cp -r libs/* ../vlc-sdk/libs
 	mkdir -p vlc-sdk/src/org/videolan