Upgrade to protobuf-3.0.0-alpha-3
diff --git a/buildscripts/make_dependencies.sh b/buildscripts/make_dependencies.sh
index afafaa8..e354c6a 100755
--- a/buildscripts/make_dependencies.sh
+++ b/buildscripts/make_dependencies.sh
@@ -5,14 +5,14 @@
 
 # Make protoc
 # Can't check for presence of directory as cache auto-creates it.
-if [ -f /tmp/proto3-a2/bin/protoc ]; then
+if [ -f /tmp/proto3-a3/bin/protoc ]; then
   echo "Not building protobuf. Already built"
 else
-  wget -O - https://github.com/google/protobuf/archive/v3.0.0-alpha-2.tar.gz | tar xz -C /tmp
-  pushd /tmp/protobuf-3.0.0-alpha-2
+  wget -O - https://github.com/google/protobuf/archive/v3.0.0-alpha-3.tar.gz | tar xz -C /tmp
+  pushd /tmp/protobuf-3.0.0-alpha-3
   ./autogen.sh
   # install here so we don't need sudo
-  ./configure --prefix=/tmp/proto3-a2
+  ./configure --prefix=/tmp/proto3-a3
   make -j2
   make install
   popd