$(DOXYGEN_COMBINED_XML): $(DOXYGEN_TAG_FILE_XML)
@xsltproc $(dir $@)/combine.xslt $(dir $@)/index.xml > $(DOXYGEN_COMBINED_XML)
$(DOXYGEN_COMBINED_XML): $(DOXYGEN_TAG_FILE_XML)
@xsltproc $(dir $@)/combine.xslt $(dir $@)/index.xml > $(DOXYGEN_COMBINED_XML)