error : Unknown IO error warning: failed to load external entity “http://docbook.sourceforge.net/rel

shell error : Unknown IO error warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl" compilation error: file /home/ljh/mqtt/mosquitto/man/manpage.xsl line 3 element import xsl:import : unable to load http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl compilation error: file /home/ljh/mqtt/mosquitto/man/mosquitto_rr.1.xml line 4 element refentry xsltParseStylesheetProcess : document is not a stylesheet make[2]: *** [man/CMakeFiles/mosquitto_rr.1.dir/build.make:80: ../man/mosquitto_rr.1] Error 5 make[1]: *** [CMakeFiles/Makefile2:604: man/CMakeFiles/mosquitto_rr.1.dir/all] Error 2 make: *** [Makefile:160: all] Error 2

解决方法

sudo apt-get install xmlto

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