In Bug 208, bernhardf writes:

On machines with only ANSI compliant compilers, not explitily delcaring
an empty parameter list 'void' causes failure.

coreutils/test.c

@@ -310,7 +310,7 @@ static arith_t primary(enum token n)
 	return strlen(*t_wp) > 0;
 }
 
-static int binop()
+static int binop(void)
 {
 	const char *opnd1, *opnd2;
 	struct t_op const *op;
@@ -537,7 +537,7 @@ static int test_eaccess(char *path, int mode)
 	return (-1);
 }
 
-static void initialize_group_array()
+static void initialize_group_array(void)
 {
 	ngroups = getgroups(0, NULL);
 	group_array = xrealloc(group_array, ngroups * sizeof(gid_t));