m4出现Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."

安装M4出现这样的问题
m4出现Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
建议下载较老版本，就不会出现这样的问题啦！
下载地址：https://ftp.gnu.org/gnu/m4/

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