update of autoconf

builds/libraries/libffi

@@ -6,13 +6,15 @@ OUT_PREFIX=$1
 echo "Building autoconf..."
 
 
-git clone git://git.sv.gnu.org/autoconf
-cd autoconf
+SOURCE_TARBALL='http://ftp.gnu.org/gnu/autoconf/autoconf-2.68.tar.gz'
+curl -L $SOURCE_TARBALL | tar xz
+
+cd autoconf-2.68
 ./configure --prefix=$OUT_PREFIX
 make
 make install
 cd ..
-rm -fr autoconf
+rm -fr autoconf-2.68
 
 # Use new Python path, containing autoconf.
 export PATH="/app/.heroku/python/bin/:$PATH"