Libtool library used but `LIBTOOL' is undefined

Install HandlerSocket 时，报如下错误:

handlersocket/Makefile.am:3: Libtool library used but `LIBTOOL' is undefined

(Solution) Libtool library used but `LIBTOOL' is undefined这里有提到类似的问题，解决办法很简单，合并文件后，删除多余的，然后创建一符号链接。

This is caused because FreeBSD renames the default tools, like aclocal to aclocal19. When aclocal is run, it looks for files in its FreeBSD set directory,
/usr/local/share/aclocal19 but most normal apps, like libtool, install to /usr/local/share/aclocal. The solution? Simple! Just merge the contents into one
directory, delete the other, and create a symlink!

当然，也可以直接：
[bash]
cp -R /usr/local/share/aclocal /usr/share/
[/bash]