xsltproc error when building any source
make[2]: Leaving directory '/var/inary/git-2.28.0-1/work/git-2.28.0'
rm -f user-manual.html+ user-manual.html && \
xsltproc --xinclude --stringparam html.stylesheet docbook-xsl.css -o user-manual.html+ docbook.xsl user-manual.xml && \
mv user-manual.html+ user-manual.html
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl"
compilation error: file docbook.xsl line 3 element import
xsl:import : unable to load http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
make[1]: *** [Makefile:384: user-manual.html] Error 5
make[1]: Leaving directory '/var/inary/git-2.28.0-1/work/git-2.28.0/Documentation'
make: *** [Makefile:2512: doc] Error 2
make: *** Waiting for unfinished jobs....
how can I fix this issue
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