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-rw-r--r--doc/src/sgml/Makefile14
1 files changed, 8 insertions, 6 deletions
diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index 271c700065c..1d42be8951b 100644
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -27,27 +27,29 @@ all: html man
distprep: html distprep-man
+ifndef DBTOEPUB
+DBTOEPUB = $(missing) dbtoepub
+endif
+
ifndef JADE
-JADE = jade
+JADE = $(missing) jade
endif
SGMLINCLUDE = -D . -D $(srcdir)
ifndef NSGMLS
-NSGMLS = nsgmls
+NSGMLS = $(missing) nsgmls
endif
ifndef OSX
-OSX = osx
+OSX = $(missing) osx
endif
ifndef XSLTPROC
-XSLTPROC = xsltproc
+XSLTPROC = $(missing) xsltproc
endif
override XSLTPROCFLAGS += --stringparam pg.version '$(VERSION)'
-DBTOEPUB ?= dbtoepub
-
GENERATED_SGML = bookindex.sgml version.sgml \
features-supported.sgml features-unsupported.sgml errcodes-table.sgml