More thorough test for working <stdarg.h>.
diff --git a/configure.in b/configure.in
index bc82b06..2e90bdc 100644
--- a/configure.in
+++ b/configure.in
@@ -376,8 +376,15 @@
AC_MSG_CHECKING(for variable length prototypes and stdarg.h)
AC_TRY_COMPILE([
#include <stdarg.h>
-int foo(int x, ...) { return 0; }
-], [return foo(10, 11, 12);],
+int foo(int x, ...) {
+ va_list va;
+ va_start(va, x);
+ va_arg(va, int);
+ va_arg(va, char *);
+ va_arg(va, double);
+ return 0;
+}
+], [return foo(10, "", 3.14);],
AC_DEFINE(HAVE_STDARG_PROTOTYPES) works=yes)
AC_MSG_RESULT($works)