diff --git a/acinclude.m4 b/acinclude.m4
index 2e2fcb9bc..47df58241 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -596,3 +596,60 @@ if test "$ac_cv_type_sig_atomic_t" = no; then
 fi
 AC_MSG_RESULT($ac_cv_type_sig_atomic_t)
 ])
+
+AC_DEFUN(AC_BROKEN_SNPRINTF, [
+AC_CACHE_CHECK(for working snprintf,ac_cv_func_snprintf_working,
+ac_cv_func_snprintf_working=yes
+AC_TRY_RUN([
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+changequote(`,')dnl
+	char foo[3];
+changequote([,])dnl
+	snprintf(foo, 2, "12");
+	return strcmp(foo, "1");
+}],:,ac_cv_func_snprintf_working=no,:))
+: << END
+@@@funcs="$funcs snprintf"@@@
+END
+if test "$ac_cv_func_snprintf_working" = yes; then
+	foo=HAVE_SNPRINTF
+	AC_DEFINE_UNQUOTED($foo)
+fi
+])
+
+AC_DEFUN(AC_BROKEN_VSNPRINTF,[
+AC_CACHE_CHECK(for working vsnprintf,ac_cv_func_vsnprintf_working,
+ac_cv_func_vsnprintf_working=yes
+AC_TRY_RUN([
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+int foo(int num, ...)
+{
+changequote(`,')dnl
+	char bar[3];
+changequote([,])dnl
+	va_list arg;
+	va_start(arg, num);
+	vsnprintf(bar, 2, "%s", arg);
+	va_end(arg);
+	return strcmp(bar, "1");
+}
+
+
+int main()
+{
+	return foo(0, "12");
+}],:,ac_cv_func_vsnprintf_working=no,:))
+: << END
+@@@funcs="$funcs vsnprintf"@@@
+END
+if test "$ac_cv_func_vsnprintf_working" = yes; then
+	foo=HAVE_VSNPRINTF
+	AC_DEFINE_UNQUOTED($foo)
+fi
+])
\ No newline at end of file