-dnl Emacs (optional), for 'etc/indent-package.el'.
-AC_PATH_PROG([EMACS], [emacs], [/usr/bin/emacs])
-AC_SUBST([EMACS])
+dnl Emacs (optional), for 'etc/indent-code.el'.
+AC_PATH_PROG([EMACS], [emacs])
+if test "x$EMACS" = x; then
+ AC_MSG_WARN([Please install GNU Emacs to use etc/indent-code.el.])
+else
+ AC_SUBST([EMACS])
+ AC_CONFIG_FILES([etc/indent-code.el], [chmod +x etc/indent-code.el])
+fi