Update OTS to revision a7a3b94

third_party/ots/INSTALL

Index: third_party/ots/INSTALL
diff --git a/third_party/ots/INSTALL b/third_party/ots/INSTALL
index 4276b81b61fcdf7fb0479b19fb0a4f7e4dc804ab..c50bb5419bd2a1c4cafd2e5f8e2e01493656528a 100644
--- a/third_party/ots/INSTALL
+++ b/third_party/ots/INSTALL
@@ -1,14 +1,10 @@
-How to build:
+General build instructions:
 
-  1. If you are building from cloned Git repository, make sure to update the
-     submodules as well:
+  1. If you are building from cloned Git repository, you will need to update
+     the git sub modules, as well as run autoreconf. A convenience script is
+     provided:
 
-     $ git submodule init
-     $ git submodule update
-
-     Then run autoreconf
-
-     $ autoreconf -if
+     $ ./autogen.sh
 
   2. Build OTS
 
@@ -18,3 +14,15 @@ How to build:
   3. Run the tests (if you wish)
 
      $ make check
+
+Building on Windows:
+
+   1. A POSIX-compatible environment is required to build OTS, MSYS2 is
+      recommended. Follow the installation instructions on
+	  https://msys2.github.io/.
+
+   2. Install the required packages:
+
+      $ pacman -S autoconf automake pkg-config gcc make zlib-devel
+
+   3. Follow the general build instructions above.