-# iswblank.m4 serial 1
+# iswblank.m4 serial 2
dnl Copyright (C) 2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
[
AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
AC_REQUIRE([gl_WCTYPE_H])
+ dnl Persuade glibc <wctype.h> to declare iswblank().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([iswblank])
AC_CHECK_DECLS_ONCE([iswblank])
if test $ac_cv_func_iswblank = no; then