[PATCH 2/2] doc: Don't install emacs docs when they are not built

[David Bremner]

In 40b025 we stopped building the notmuch-emacs documentation if
HAVE_EMACS=0 (i.e. no emacs was detected by configure). Unfortunately
we continued to try to install the (non-existent) documentation, which
causes build/install failures.

As a bonus, we also avoid installing the documentation if the user
configures --without-emacs.

Thanks to Ralph Seichter for reporting the problem, and testing
previous versions of this fix.
---
 doc/Makefile.local | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/doc/Makefile.local b/doc/Makefile.local
index a88beb46..d733b51e 100644
--- a/doc/Makefile.local
+++ b/doc/Makefile.local
@@ -28,7 +28,11 @@ MAN_GZIP_FILES := $(addsuffix .gz,${MAN_ROFF_FILES})
 MAN1_TEXI := $(patsubst $(srcdir)/doc/man1/%.rst,$(DOCBUILDDIR)/texinfo/%.texi,$(MAN1_RST))
 MAN5_TEXI := $(patsubst $(srcdir)/doc/man5/%.rst,$(DOCBUILDDIR)/texinfo/%.texi,$(MAN5_RST))
 MAN7_TEXI := $(patsubst $(srcdir)/doc/man7/%.rst,$(DOCBUILDDIR)/texinfo/%.texi,$(MAN7_RST))
-INFO_TEXI_FILES := $(MAN1_TEXI) $(MAN5_TEXI) $(MAN7_TEXI) $(DOCBUILDDIR)/texinfo/notmuch-emacs.texi
+INFO_TEXI_FILES := $(MAN1_TEXI) $(MAN5_TEXI) $(MAN7_TEXI)
+ifeq ($(HAVE_EMACS)$(WITH_EMACS),11)
+	INFO_TEXI_FILES := $(INFO_TEXI_FILES) $(DOCBUILDDIR)/texinfo/notmuch-emacs.texi
+endif
+
 INFO_INFO_FILES := $(INFO_TEXI_FILES:.texi=.info)
 
 .PHONY: sphinx-html sphinx-texinfo sphinx-info
-- 
2.20.1