doc: Add make target to produce EPUB from DocBook

diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index f40a1fe7fc28dcc8a19f7bab6a6f4679635bd83f..aeade13dff38b928908fdb16ac2dca80791cdb58 100644 (file)
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -46,6 +46,8 @@ endif
 
 override XSLTPROCFLAGS += --stringparam pg.version '$(VERSION)'
 
+DBTOEPUB ?= dbtoepub
+
 
 GENERATED_SGML = bookindex.sgml version.sgml \
    features-supported.sgml features-unsupported.sgml errcodes-table.sgml
@@ -271,6 +273,10 @@ htmlhelp: stylesheet-hh.xsl postgres.xml
 %-US.fo: stylesheet-fo.xsl %.xml
    $(XSLTPROC) $(XSLTPROCFLAGS) --stringparam paper.type USletter -o $@ $^
 
+epub: postgres.epub
+postgres.epub: postgres.xml
+   $(DBTOEPUB) $<
+
 
 ##
 ## Experimental Texinfo targets
@@ -385,6 +391,8 @@ clean:
    rm -f HTML.index $(GENERATED_SGML)
 # XSLT
    rm -f postgres.xml postgres.xmltmp htmlhelp.hhp toc.hhc index.hhk *.fo
+# EPUB
+   rm -f postgres.epub
 # Texinfo
    rm -f *.texixml *.texi *.info db2texi.refs