autoreconf命令"possibly undefined macro: AC_ENABLE_SHARED"错误解决

在一些环境中运行autoreconf或者autogen.sh时有时候会出现如下问题：

configure.ac:163: error: possibly undefined macro: AC_ENABLE_SHARED
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:164: error: possibly undefined macro: AC_PROG_LIBTOOL
autoreconf: /usr/bin/autoconf failed with exit status: 1

出现这种类似问题一个原因是相关的库没有安装，或者是库的位置对不上，可通过如下方法逐步排查：

1 先安装相关软件包

sudo apt install automake libtool m4 autoconf

2 检查安装目录

grep "AC_ENABLE_SHARED" --color -rn /usr/

通过上述命令查看AC_ENABLE_SHARED这些宏在哪个目录下文件定义，例如我的环境是在/usr/share/aclocal目录下：

-bash-4.2$ grep "AC_ENABLE_SHARED" --color -rn /usr/share/*
/usr/share/aclocal/ltoptions.m4:195:AC_DEFUN([AC_ENABLE_SHARED],
/usr/share/aclocal/ltoptions.m4:203:AU_DEFUN([AM_ENABLE_SHARED], [AC_ENABLE_SHARED($@)])

3 指定lib目录解决无法找到宏的问题

autoreconf --include=/usr/share/aclocal/