diff --git a/build-common.sh b/build-common.sh
index f84a9e3..9f0029b 100644
--- a/build-common.sh
+++ b/build-common.sh
@@ -99,12 +99,16 @@
     GIT_REPO="$SCRATCH/prebuilts/$PROJ/$OS-x86"
     cd $GIT_REPO
     git rm -r * || true  # ignore error caused by empty directory
+    if [ -n "${EXTRA_FILE}" ]; then
+	git reset -- $EXTRA_FILE
+	git checkout HEAD -- $EXTRA_FILE
+    fi
     mv $INSTALL/* $GIT_REPO
     cp $SCRIPT_FILE $GIT_REPO
     cp $COMMON_FILE $GIT_REPO
 
     git add .
-    git commit -m "Adding binaries for $INSTALL_VER"
+    git commit -m "Adding binaries for ${INSTALL_VER}${EXTRA_COMMIT_MSG}"
 
     # execute this command to upload
     #git push origin HEAD:refs/for/master
diff --git a/build-ninja.sh b/build-ninja.sh
index c5e9cf3..791618f 100755
--- a/build-ninja.sh
+++ b/build-ninja.sh
@@ -4,7 +4,8 @@
 # leaves output in /tmp/prebuilts/ninja/$OS-x86/
 
 PROJ=ninja
-VER=1.6.0
+VER=master
+BASE_VER=v1.6.0
 MSVS=2013
 
 source $(dirname "$0")/build-common.sh build-common.sh
@@ -14,9 +15,12 @@
 
 # ninja specific steps
 cd $RD
-git clone https://github.com/martine/ninja.git src
+git clone https://android.googlesource.com/platform/external/ninja.git src
 cd src
-git checkout v$VER
+git remote add upstream https://github.com/martine/ninja.git
+git fetch upstream
+git checkout $VER
+INSTALL_VER=${INSTALL_VER/${VER}/${VER}-$(git rev-parse --short=12 HEAD)}
 if [[ "$OS" == "windows" ]] ; then
 	 PLATFORM="--platform=msvc"
 fi
@@ -25,4 +29,7 @@
 # install
 cp $RD/src/ninja $INSTALL
 
+EXTRA_FILE="LICENSE MODULE_LICENSE_APL"
+EXTRA_COMMIT_MSG=$(echo -e "\n\nChanges since ${BASE_VER}:" && git log --oneline --abbrev=12 ${BASE_VER}..HEAD)
+
 commit_and_push
diff --git a/ninja b/ninja
index ebcc155..814292e 100755
--- a/ninja
+++ b/ninja
Binary files differ