DocBook: Add a help message for DOCBOOKS env var
Sometimes, it is needed to compile only a subset of the possible DocBooks. This is supported by the building system, but it is not docummented. Add a documentation for it. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -227,6 +227,10 @@ dochelp:
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@echo ' mandocs - man pages'
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@echo ' installmandocs - install man pages generated by mandocs'
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@echo ' cleandocs - clean all generated DocBook files'
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@echo
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@echo 'make DOCBOOKS="s1.xml s2.xml" [target] Generate only docs s1.xml s2.xml'
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@echo ' valid values for DOCBOOKS are: $(DOCBOOKS)'
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###
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# Temporary files left by various tools
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