autogen.sh: Create m4 directory for leveldb submodule.

diff --git a/autogen.sh b/autogen.sh
index 1eb2abc221d9e75351e5ccbca9570983c42c6ca8..6dc98085f6badb0543a2becf8b5e9a542f4bd44d 100755 (executable)
--- a/autogen.sh
+++ b/autogen.sh
@@ -19,5 +19,5 @@ autoconf
 autoheader
 automake -a --add-missing -Wall
 ( cd src/gtest && autoreconf -fvi; )
-( cd src/leveldb && autoreconf -fvi; )
+( cd src/leveldb && mkdir m4 && autoreconf -fvi; )
 exit