It seems during build for ods-kasp2html it is checked whether xmllint and
xsltproc are available. If not, the XMLLINT and/or XSLTPROC variables
are left empty. This seems silly, you might as well just put "xmllint"
and "xsltproc" there, as the alternative is to not work at all anyway.
What happens now is that if the build system does not have these, but
the runtime system does, ods-kaps2html does not run.