Because ruby generates a Makefile, we have to use recursive make.
Because mkmf.rb hardcodes the name Makefile, put our Makefile{.local}
in the parent directory.
---
 Makefile.local          |  2 +-
 bindings/Makefile       |  7 +++++++
 bindings/Makefile.local | 18 ++++++++++++++++++
 bindings/ruby/README    |  8 ++++++++
 configure               | 18 ++++++++++++++++++
 debian/rules            |  1 -
 6 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 bindings/Makefile
 create mode 100644 bindings/Makefile.local
 create mode 100644 bindings/ruby/README

diff --git a/Makefile.local b/Makefile.local
index 81ee347..7204267 100644
--- a/Makefile.local
+++ b/Makefile.local
@@ -59,7 +59,7 @@ endif
 FINAL_LIBNOTMUCH_LDFLAGS = $(LDFLAGS) $(AS_NEEDED_LDFLAGS) $(CONFIGURE_LDFLAGS)

 .PHONY: all
-all: notmuch notmuch-shared build-man
+all: notmuch notmuch-shared build-man ruby-bindings
 ifeq ($(MAKECMDGOALS),)
 ifeq ($(shell cat .first-build-message 2>/dev/null),)
        @NOTMUCH_FIRST_BUILD=1 $(MAKE) --no-print-directory all
diff --git a/bindings/Makefile b/bindings/Makefile
new file mode 100644
index 0000000..de492a7
--- /dev/null
+++ b/bindings/Makefile
@@ -0,0 +1,7 @@
+# See Makefile.local for the list of files to be compiled in this
+# directory.
+all:
+       $(MAKE) -C .. all
+
+.DEFAULT:
+       $(MAKE) -C .. $@
diff --git a/bindings/Makefile.local b/bindings/Makefile.local
new file mode 100644
index 0000000..6ed1344
--- /dev/null
+++ b/bindings/Makefile.local
@@ -0,0 +1,18 @@
+# -*- makefile -*-
+
+dir := bindings
+
+# force the shared library to be build
+ruby-bindings: lib/libnotmuch.so
+ifeq ($(HAVE_RUBY_DEV),1)
+       cd $(dir)/ruby && ruby extconf.rb --vendor
+       $(MAKE) -C $(dir)/ruby
+else
+       @echo Missing dependency, skipping ruby bindings
+endif
+
+CLEAN += $(patsubst %,$(dir)/ruby/%, \
+       Makefile database.o directory.o filenames.o\
+       init.o message.o messages.o mkmf.log notmuch.so query.o \
+       status.o tags.o thread.o threads.o)
+
diff --git a/bindings/ruby/README b/bindings/ruby/README
new file mode 100644
index 0000000..6bb8cb2
--- /dev/null
+++ b/bindings/ruby/README
@@ -0,0 +1,8 @@
+To build the the notmuch ruby extensions, run the following commands
+from the *top level* notmuch source directory:
+
+% ./configure
+% make ruby-bindings
+
+The generic documentation about building notmuch also applies.
+
diff --git a/configure b/configure
index d14e7d1..7df3b29 100755
--- a/configure
+++ b/configure
@@ -21,6 +21,7 @@ srcdir=$(dirname "$0")

 subdirs="util compat lib parse-time-string completion doc emacs"
 subdirs="${subdirs} performance-test test test/test-databases"
+subdirs="${subdirs} bindings"

 # For a non-srcdir configure invocation (such as ../configure), create
 # the directory structure and copy Makefiles.
@@ -426,6 +427,15 @@ else
     have_doxygen=0
 fi

+printf "Checking for ruby development files... "
+if ruby -e "require 'mkmf'"> /dev/null 2>&1; then
+    printf "Yes.\n"
+    have_ruby_dev=1
+else
+    printf "No (skipping ruby bindings)\n"
+    have_ruby_dev=0
+fi
+
 printf "Checking if sphinx is available and supports nroff output... "
 if hash sphinx-build > /dev/null 2>&1 && python -m sphinx.writers.manpage > 
/dev/null 2>&1 ; then
     printf "Yes.\n"
@@ -848,6 +858,10 @@ HAVE_CANONICALIZE_FILE_NAME = 
${have_canonicalize_file_name}
 # build its own version)
 HAVE_GETLINE = ${have_getline}

+# Are the ruby development files (and ruby) available? If not skip
+# building/testing ruby bindings.
+HAVE_RUBY_DEV = ${have_ruby_dev}
+
 # Whether the strcasestr function is available (if not, then notmuch will
 # build its own version)
 HAVE_STRCASESTR = ${have_strcasestr}
@@ -958,6 +972,10 @@ NOTMUCH_HAVE_XAPIAN_COMPACT=${have_xapian_compact}
 # Whether there's either sphinx or rst2man available for building
 # documentation
 NOTMUCH_HAVE_MAN=$((have_sphinx || have_rst2man))
+
+# Are the ruby development files (and ruby) available? If not skip
+# building/testing ruby bindings.
+NOTMUCH_HAVE_RUBY_DEV=${have_ruby_dev}
 EOF

 # Finally, after everything configured, inform the user how to continue.
diff --git a/debian/rules b/debian/rules
index 7a19445..ca85bc7 100755
--- a/debian/rules
+++ b/debian/rules
@@ -12,7 +12,6 @@ override_dh_auto_build:
        dh_auto_build -- V=1
        dh_auto_build --sourcedirectory bindings/python
        cd bindings/python && $(python3_all) setup.py build
-       cd bindings/ruby && ruby extconf.rb --vendor && make
        $(MAKE) -C contrib/notmuch-mutt

 override_dh_auto_clean:
-- 
2.1.3

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