[gnome-panel] configure.ac: check for autconf-archive

[Sebastian Geiger <segeiger src gnome org>]

commit f6561fdbdd812db719e376f8fe2fef49eb668b47
Author: Sebastian Geiger <sbastig gmx net>
Date:   Sat Jan 6 09:37:46 2018 +0100

    configure.ac: check for autconf-archive

 configure.ac |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index aa079f3..1284a58 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,14 @@ dnl **************************************************************************
 dnl Set release policy
 dnl **************************************************************************
 
-AX_IS_RELEASE([git-directory])
+m4_ifdef([AX_IS_RELEASE], [
+  AX_IS_RELEASE([git-directory])
+], [
+  AC_MSG_ERROR([m4_normalize([
+    could not find AX_IS_RELEASE macro. Please install the
+    'autoconf-archive' package.
+  ])])
+])
 
 dnl **************************************************************************
 dnl Enable debug