[PATCH] build: Allow user to specify ruby executable

[Thomas Schneider <qsx@chaotikum.eu>]

This way, one can build for a different Ruby than $PATH/ruby
(e. g. different versions, or Ruby in other paths).

Signed-off-by: Thomas Schneider <qsx@chaotikum.eu>
---
 bindings/Makefile.local |  2 +-
 configure               | 11 ++++++++++-
 test/test-lib.sh        |  2 +-
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/bindings/Makefile.local b/bindings/Makefile.local
index 17b561ca..2ba2775c 100644
--- a/bindings/Makefile.local
+++ b/bindings/Makefile.local
@@ -9,7 +9,7 @@ ifeq ($(HAVE_RUBY_DEV),1)
 		EXTRA_LDFLAGS="$(NO_UNDEFINED_LDFLAGS)" \
 		LIBNOTMUCH="../../lib/$(LINKER_NAME)" \
 		NOTMUCH_SRCDIR='$(NOTMUCH_SRCDIR)' \
-		ruby extconf.rb --vendor
+		$(RUBY) extconf.rb --vendor
 	$(MAKE) -C $(dir)/ruby
 endif
 
diff --git a/configure b/configure
index b177b141..392213b6 100755
--- a/configure
+++ b/configure
@@ -62,6 +62,7 @@ CXXFLAGS=${CXXFLAGS:-\$(CFLAGS)}
 LDFLAGS=${LDFLAGS:-}
 XAPIAN_CONFIG=${XAPIAN_CONFIG:-}
 PYTHON=${PYTHON:-}
+RUBY=${RUBY:-ruby}
 
 # We don't allow the EMACS or GZIP Makefile variables inherit values
 # from the environment as we do with CC and CXX above. The reason is
@@ -118,6 +119,8 @@ Other environment variables can be used to control configure itself,
 			library. [$XAPIAN_CONFIG]
 	PYTHON		Name of python command to use in
 			configure and the test suite.
+	RUBY		Name of ruby command to use in
+			configure and the test suite.
 
 Additionally, various options can be specified on the configure
 command line.
@@ -621,7 +624,7 @@ fi
 have_ruby_dev=0
 if [ $WITH_RUBY = "1" ] ; then
     printf "Checking for ruby development files... "
-    if ruby -e "require 'mkmf'"> /dev/null 2>&1; then
+    if ${RUBY} -e "require 'mkmf'"> /dev/null 2>&1; then
 	printf "Yes.\n"
 	have_ruby_dev=1
     else
@@ -1027,6 +1030,9 @@ WARN_CFLAGS=${WARN_CFLAGS}
 # Name of python interpreter
 PYTHON = ${python}
 
+# Name of ruby interpreter
+RUBY = ${RUBY}
+
 # The prefix to which notmuch should be installed
 # Note: If you change this value here, be sure to ensure that the
 # LIBDIR_IN_LDCONFIG value below is still set correctly.
@@ -1234,6 +1240,9 @@ NOTMUCH_HAVE_MAN=$((have_sphinx))
 # Name of python interpreter
 NOTMUCH_PYTHON=${python}
 
+# Name of ruby interpreter
+NOTMUCH_RUBY=${RUBY}
+
 # Are the ruby development files (and ruby) available? If not skip
 # building/testing ruby bindings.
 NOTMUCH_HAVE_RUBY_DEV=${have_ruby_dev}
diff --git a/test/test-lib.sh b/test/test-lib.sh
index 5b212514..7e064021 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -1003,7 +1003,7 @@ test_python() {
 }
 
 test_ruby() {
-    MAIL_DIR=$MAIL_DIR ruby -I $NOTMUCH_SRCDIR/bindings/ruby> OUTPUT
+    MAIL_DIR=$MAIL_DIR $NOTMUCH_RUBY -I $NOTMUCH_SRCDIR/bindings/ruby> OUTPUT
 }
 
 test_C () {
-- 
2.17.0