-#serial 6
+#serial 7
dnl SunOS's readdir is broken in such a way that rm.c has to add extra code
dnl to test whether a NULL return value really means there are no more files
AC_DEFUN([GL_FUNC_READDIR],
[dnl
AC_REQUIRE([AC_HEADER_DIRENT])
-AC_CHECK_HEADERS_ONCE(string.h)
AC_CACHE_CHECK([for working readdir], gl_cv_func_working_readdir,
[dnl
# Arrange for deletion of the temporary directory this test creates, in
AC_TRY_RUN(
[# include <stdio.h>
# include <sys/types.h>
-# if HAVE_STRING_H
-# include <string.h>
-# endif
+# include <string.h>
# ifdef HAVE_DIRENT_H
# include <dirent.h>