问题1
make编译报错，提示xsltproc命令未找到
解决办法：
yum install libxslt
问题2
make编译报错，提示: failed to load external entity "/usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl"
unable to load /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl
解决办法：
yum install docbook-style-xsl
find / -name docbook.xsl
修改mosquitto源码文件man文件夹下manpage.xsl文件，修改后如下：
