diff --git a/acinclude.m4 b/acinclude.m4
index 74f1e09..44cface 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,17 +1,16 @@
 dnl AC_REPLACE_GNU_GETOPT
-AC_DEFUN(AC_REPLACE_GNU_GETOPT,
+AC_DEFUN([AC_REPLACE_GNU_GETOPT],
 [AC_CHECK_FUNCS([getopt_long], , [LIBOBJS="$LIBOBJS getopt.o getopt1.o"])
 AC_SUBST(LIBOBJS)dnl
 ])
 
 dnl Test for __attribute__
-AC_DEFUN(VH___ATTRIBUTE__, [
+AC_DEFUN([VH___ATTRIBUTE__], [
 AC_MSG_CHECKING(for __attribute__)
 AC_CACHE_VAL(ac_cv___attribute__, [
 AC_TRY_COMPILE([
 #include <stdlib.h>
-],
-[
+
 static void foo(void) __attribute__ ((noreturn));
 
 static void
@@ -20,6 +19,8 @@ foo(void)
   exit(1);
 }
 ],
+[
+],
 ac_cv___attribute__=yes,
 ac_cv___attribute__=no)])
 if test "$ac_cv___attribute__" = "yes"; then