- make -C $(DOCBUILDDIR)/texinfo info
-
-# fallback target in case sphinx not installed
-rst2man:
- $(prerst2man) $(DOCBUILDDIR)/.. $(DOCBUILDDIR)/man
-
--include $(dir)/docdeps.mk
-
-MAN_GZIP_FILES := $(addsuffix .gz,${MAN_ROFF_FILES})
-
-${MAN_ROFF_FILES} : sphinx-man
-
+ $(MAKE) -C $(DOCBUILDDIR)/texinfo info
+
+# Use the man page converter that is available. We should never depend
+# on MAN_ROFF_FILES if a converter is not available.
+${MAN_ROFF_FILES}: $(DOCBUILDDIR)/.roff.stamp
+
+# By using $(DOCBUILDDIR)/.roff.stamp instead of ${MAN_ROFF_FILES}, we
+# convey to make that a single invocation of this recipe builds all
+# of the roff files. This prevents parallel make from starting an
+# instance of this recipe for each roff file.
+$(DOCBUILDDIR)/.roff.stamp: ${MAN_RST_FILES}
+ifeq ($(HAVE_SPHINX),1)
+ $(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(DOCBUILDDIR)/man
+ for section in 1 5 7; do \
+ mkdir -p $(DOCBUILDDIR)/man/man$${section}; \
+ mv $(DOCBUILDDIR)/man/*.$${section} $(DOCBUILDDIR)/man/man$${section}; \
+ done
+else
+ @echo "Fatal: build dependency fail."
+ @false
+endif
+ touch $@
+
+install-man: install-apidocs
+
+ifeq ($(HAVE_DOXYGEN),1)
+MAN_GZIP_FILES += ${APIMAN}.gz
+apidocs: $(APIMAN)
+install-apidocs: ${APIMAN}.gz
+ mkdir -p "$(DESTDIR)$(mandir)/man3"
+ install -m0644 $(filter %.3.gz,$(MAN_GZIP_FILES)) $(DESTDIR)/$(mandir)/man3
+
+$(APIMAN): $(dir)/config.dox $(srcdir)/$(dir)/doxygen.cfg $(srcdir)/lib/notmuch.h
+ mkdir -p $(DOCBUILDDIR)/man/man3
+ doxygen $(DOXYFILE)
+ rm -f $(DOCBUILDDIR)/man/man3/_*.3
+ perl -pi -e 's/^[.]RI "\\fI/.RI "\\fP/' $(APIMAN)
+else
+apidocs:
+install-apidocs:
+endif
+
+# Do not try to build or install man pages if a man page converter is
+# not available.
+ifeq ($(HAVE_SPHINX),0)
+build-man:
+install-man:
+ @echo "No sphinx, will not install man pages."
+else
+build-man: ${MAN_GZIP_FILES}