automake 1.13 removes the definition for the latter, citing the former
as being long since deprecated.

http://lists.gnu.org/archive/html/automake/2012-12/msg00040.html

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index ff48c5b..a22fdea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,7 +35,7 @@ This configure script may be copied, distributed and modified under the
 terms of the curl license; see COPYING for more details])
 
 AC_CONFIG_SRCDIR([lib/urldata.h])
-AM_CONFIG_HEADER(lib/curl_config.h include/curl/curlbuild.h)
+AC_CONFIG_HEADERS(lib/curl_config.h include/curl/curlbuild.h)
 AC_CONFIG_MACRO_DIR([m4])
 AM_MAINTAINER_MODE
 
-- 
1.8.0.3
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