From 43db9a23ee3b0294180eb50eb78d38cd387eb72c Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Tue, 19 Oct 2021 14:43:04 +0530
Subject: configure: Warn if emacs is not found.

* configure.ac (OPTIONAL_PROGRAM): New macro.
Use OPTIONAL_PROGRAM to check for emacs.
---
 configure.ac | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 8f7d7ed..1f0cf90 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,13 +36,18 @@ AC_DEFUN([CHECK_FOR_PROGRAM], [
 AC_DEFUN([REQUIRED_PROGRAM], [
   CHECK_FOR_PROGRAM([$1], [$2], [AC_MSG_ERROR([cannot find $2 m4_ifnblank([$3], [from the $3 package])])])
 ])
+
+# OPTIONAL_PROGRAM(VARIABLE, PROGRAM-TO-CHECK-FOR, WARNING)
+# ----------------------------------------------------------------------------
+AC_DEFUN([OPTIONAL_PROGRAM], [
+  CHECK_FOR_PROGRAM([$1], [$2], [AC_MSG_WARN([$3])])
 ])
 
 AC_PROG_SED
 REQUIRED_PROGRAM([DOT], [dot], [graphviz])
 REQUIRED_PROGRAM([CWLTOOL], [cwltool])
 REQUIRED_PROGRAM([SKRIBILO], [skribilo])
-AC_PATH_PROG([EMACS], [emacs])
+OPTIONAL_PROGRAM([EMACS], [emacs], [cannot find emacs, and therefore cannot build the website])
 
 AC_CONFIG_FILES([Makefile])
 AC_CONFIG_FILES([pre-inst-env], [chmod +x pre-inst-env])
-- 
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