c3-lang/libffi

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6e04484..ca53466 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -116,13 +116,14 @@ jobs:
       - uses: actions/checkout@v2
 
       - run: |
-          set -x
           wget -qO - https://ftpmirror.gnu.org/autoconf/autoconf-2.71.tar.gz | tar -xvzf -
           mkdir -p ~/i
           (cd autoconf-2.71; ./configure --prefix=$HOME/i; make; make install)
           rm -rf autoconf-2.71
           PATH=$HOME/i/bin:$PATH ./autogen.sh
+          ls -l /tmp/cfk
           echo ${{ secrets.CFARM_KEY }} > /tmp/cfk
+          ls -l /tmp/cfk
           ssh -i /tmp/cfk ${{ matrix.CFARM_HOST }} "mkdir -p t/$GITHUB_RUN_NUMBER"
           rsync -avrz -e "ssh -i /tmp/cfk" * ${{ matrix.CFARM_HOST }}:t/$GITHUB_RUN_NUMBER
           ssh -i /tmp/cfk ${{ matrix.CFARM_HOST }} "(cd t/$GITHUB_RUN_NUMBER; ./configure; make; make check)"