DOC Building HTML warning: failed to load external entity "../xml/macros.xml" ../libxfce4panel-docs.xml:59: element include: XInclude error : could not load ../xml/macros.xml, and no fallback was found warning: failed to load external entity "../xml/register-46-plugins.xml" ../libxfce4panel-docs.xml:144: element include: XInclude error : could not load ../xml/register-46-plugins.xml, and no fallback was found warning: failed to load external entity "../xml/xfce-hvbox.xml" ../libxfce4panel-docs.xml:154: element include: XInclude error : could not load ../xml/xfce-hvbox.xml, and no fallback was found make[3]: *** [Makefile:810: html-build.stamp] Error 6 https://git.xfce.org/xfce/xfce4-panel/commit/?id=259cb898fbfda68d4b4f8f6b49ad145c5de272ac This recent commit 11 days ago breaks clean builds, when cloning to an empty dir. For some reason doing rebuilds after previous successful ones seemed to work today, which is possibly why you may have missed it. Using Artix Linux.
Simon Steinbeiss referenced this bugreport in commit d5092e12bec154b1899d9eb8b60085941ae4a899 docs: Fix build by dropping unused refs (Bug #16031) https://git.xfce.org/xfce/xfce4-panel/commit?id=d5092e12bec154b1899d9eb8b60085941ae4a899
Thanks for noticing my oversight!