c3-lang/libffi

diff --git a/.ci/install.sh b/.ci/install.sh
index 169b01f..bfbfd97 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -38,7 +38,7 @@ else
 
     set -x
     wget -qO - https://ftpmirror.gnu.org/autoconf/autoconf-2.71.tar.gz | tar -xvzf -
-    (cd autoconf-2.17; ./configure; make; make install)
+    (cd autoconf-2.71; ./configure; make; make install)
 
     case $HOST in
 	mips64el-linux-gnu | sparc64-linux-gnu)