c3-lang/libffi

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 169d6fe..136d7f7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -125,6 +125,10 @@ jobs:
           echo "${{ secrets.CFARM_KEY }}" > /tmp/cfk
           chmod go-rw /tmp/cfk
           ssh -o StrictHostKeyChecking=no -o ConnectTimeout=10 -o ConnectionAttempts=3 -i /tmp/cfk -p ${{ matrix.CFARM_PORT }} ${{ secrets.CFARM_USERNAME }}@${{ matrix.CFARM_HOST }} "mkdir -p t/$GITHUB_RUN_NUMBER"
+          if test $? -eq 255; then
+            echo "Remote host is unavailable."
+            exit 0
+          fi
           scp -o StrictHostKeyChecking=no -o ConnectTimeout=10 -o ConnectionAttempts=3 -i /tmp/cfk -P ${{ matrix.CFARM_PORT }} -r * ${{ secrets.CFARM_USERNAME }}@${{ matrix.CFARM_HOST }}:t/$GITHUB_RUN_NUMBER
           ssh -o StrictHostKeyChecking=no -o ConnectTimeout=10 -o ConnectionAttempts=3 -i /tmp/cfk -p ${{ matrix.CFARM_PORT }} ${{ secrets.CFARM_USERNAME }}@${{ matrix.CFARM_HOST }} "(cd t/$GITHUB_RUN_NUMBER; ./configure --host=$CFARM_TRIPLE; make; make check) || true"
           scp -o StrictHostKeyChecking=no -o ConnectTimeout=10 -o ConnectionAttempts=3 -i /tmp/cfk -P ${{ matrix.CFARM_PORT }} ${{ secrets.CFARM_USERNAME }}@${{ matrix.CFARM_HOST }}:t/$GITHUB_RUN_NUMBER/*/testsuite/*.log .