configure: Fix static array check

diff --git a/m4/static_array.m4 b/m4/static_array.m4
index fb6a6ca55f7597d9b310ac9df70801a2aba823db..e4466c435a8482fa219a57910877057f154a8580 100644 (file)
--- a/m4/static_array.m4
+++ b/m4/static_array.m4
@@ -1,7 +1,7 @@
 AC_DEFUN([DOVECOT_C_STATIC_ARRAY], [
   AC_CACHE_CHECK([if we can use C99 static in array sizes],i_cv_c99_static_arrays,[
     AC_TRY_COMPILE([
-      void foo(int arr[static 20]);
+      void foo(unsigned char arr[static 20]);
     ], [
     ], [
       i_cv_c99_static_arrays=yes