[PATCH] gc: fix libgcrypt detection on older machines.

[Simon Josefsson]

I've pushed this.

/Simon

* m4/gc.m4: Reject libgcrypt earlier than 1.4.4.  Collapse
copyright years because the file has been distributed every year
since it was created.
---
 ChangeLog |    6 ++++++
 m4/gc.m4  |   14 +++++++++++---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 7dfccd7..201dcc4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-05-21  Simon Josefsson  <address@hidden>
+
+       * m4/gc.m4: Reject libgcrypt earlier than 1.4.4.  Collapse
+       copyright years because the file has been distributed every year
+       since it was created.
+
 2012-05-18  Paul Eggert  <address@hidden>
 
        crypto: fix bug in large buffer handling
diff --git a/m4/gc.m4 b/m4/gc.m4
index 8287d52..1dfeb29 100644
--- a/m4/gc.m4
+++ b/m4/gc.m4
@@ -1,5 +1,5 @@
-# gc.m4 serial 8
-dnl Copyright (C) 2005-2006, 2009-2012 Free Software Foundation, Inc.
+# gc.m4 serial 9
+dnl Copyright (C) 2005-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -10,6 +10,14 @@ AC_DEFUN([gl_GC],
     AS_HELP_STRING([--with-libgcrypt], [use libgcrypt for low-level crypto]),
     libgcrypt=$withval, libgcrypt=no)
   if test "$libgcrypt" != no; then
-    AC_LIB_HAVE_LINKFLAGS([gcrypt], [gpg-error], [#include <gcrypt.h>])
+    AC_LIB_HAVE_LINKFLAGS([gcrypt], [gpg-error], [
+#include <gcrypt.h>
+/* GCRY_MODULE_ID_USER was added in 1.4.4 and gc-libgcrypt.c
+   will fail on startup if we don't have 1.4.4 or later, so
+   test for it early. */
+#if !defined GCRY_MODULE_ID_USER
+error too old libgcrypt
+#endif
+])
   fi
 ])
-- 
1.7.9.5