Seems ./src/configh.in needed to be updated as well when you updated configure.ac.

diff --git a/src/configh.in b/src/configh.in
index 247fcfbf0a730da83be46cd204985fd21807761a..6a10a140e8f7e5141360334cbe5711d3977675a8 100644 (file)
--- a/src/configh.in
+++ b/src/configh.in
@@ -60,6 +60,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Define to 1 if you have the `vsnprintf' function. */
+#undef HAVE_VSNPRINTF
+
 /* Define if yyrestart() is necessary to yyparse a new file. */
 #undef NEED_YYRESTART