user/libsigc++3: FTBFS: IO Error: failed to load external entity for DocBook
[2/129] Generating docs/docs/manual/manual_html with a custom command
FAILED: docs/docs/manual/html
/usr/bin/python3 /home/awilcox/Code/awilfox/user-next/user/libsigc++3/src/libsigc++-3.2.0/tools/tutorial-custom-cmd.py html ../docs/docs/manual/libsigc_manual.xml docs/docs/manual/html
error : Unknown IO error
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/html/chunk.xsl"
cannot parse http://docbook.sourceforge.net/release/xsl/current/html/chunk.xsl