Capture the path to `guile', when available.

.gitignore

@@ -15,3 +15,4 @@ Makefile.in
 /aclocal.m4
 /missing
 /install-sh
+/src/script/hydra-eval-guile-jobs

configure.ac

@@ -77,6 +77,13 @@ LIBS="$old_LIBS"
 PKG_CHECK_MODULES([BDW_GC], [bdw-gc])
 PKG_CHECK_MODULES([GUILE], [guile-2.0], [HAVE_GUILE=yes], [HAVE_GUILE=no])
 
+if test "x$HAVE_GUILE" = xyes; then
+  AC_PATH_PROG([GUILE], [guile])
+else
+  GUILE="guile"
+fi
+AC_SUBST([GUILE])
+
 testPath="$(dirname $(type -p expr))"
 AC_SUBST(testPath)
 
@@ -91,8 +98,12 @@ AC_CONFIG_FILES([
   src/lib/Makefile
   src/root/Makefile
   src/script/Makefile
+  src/script/hydra-eval-guile-jobs
   tests/Makefile
   tests/jobs/config.nix
 ])
 
+AC_CONFIG_COMMANDS([executable-scripts],
+  [chmod +x src/script/hydra-eval-guile-jobs])
+
 AC_OUTPUT

src/script/Makefile.am

@@ -1,15 +1,19 @@
 EXTRA_DIST =					\
+  $(distributable_scripts)			\
   hydra-control					\
-  $(bin_SCRIPTS)
+  hydra-eval-guile-jobs.in
 
-bin_SCRIPTS = \
+distributable_scripts =				\
   hydra-init					\
   hydra-build					\
   hydra-evaluator				\
-  hydra-eval-guile-jobs \
   hydra-queue-runner				\
   hydra-server					\
   hydra-update-gc-roots				\
   nix-prefetch-git				\
   nix-prefetch-bzr				\
   nix-prefetch-hg
+
+bin_SCRIPTS =					\
+  $(distributable_scripts)			\
+  hydra-eval-guile-jobs

src/script/hydra-eval-guile-jobs.in

@@ -8,7 +8,7 @@ main="(module-ref (resolve-interface '(hydra-eval-guile-jobs)) 'eval-guile-jobs)
 unset GUILE_LOAD_PATH
 unset GUILE_LOAD_COMPILED_PATH
 
-exec ${GUILE:-guile} --no-auto-compile   \
+exec ${GUILE:-@GUILE@} --no-auto-compile   \
   -l "$0" -c "(apply $main (cdr (command-line)))" "$@"
 !#
 ;;; Copyright (C) 2012  Ludovic Courtès <ludo@gnu.org>