rename configure.in and use autoreconf

.cirrus.yml

@@ -5,7 +5,7 @@ freebsd_12_task:
   freebsd_instance:
     image: freebsd-12-0-release-amd64
   install_script:
-    - pkg install -y autoconf
+    - pkg install -y autoconf automake
   build_script:
     - ./package/setup-configure
     - ./configure || { cat config.log; exit 1; }

package/setup-configure

@@ -5,6 +5,4 @@ set -e
 curl -s -o config.guess 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess'
 curl -s -o config.sub 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub'
 
-autoconf
-autoheader
-rm -rf autom4te.cache
+autoreconf