c3-lang/libffi

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a502a54..169d6fe 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -116,6 +116,7 @@ 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)