前文：
https://quantum6.blog.csdn.net/article/details/119785631
看到介绍使用：
autoreconf -vif然后出现这个错误。既然缺少，找一下，原来在下级目录libffi中有，于是：
$ cd libffi
$ autoreconf -vif
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
autoreconf: configure.ac: tracing
autoreconf: running: libtoolize --copy --force
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACR
……
