1# isblank.m4 serial 3
2dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_ISBLANK],
8[
9  dnl Persuade glibc <ctype.h> to declare isblank().
10  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
11
12  AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
13  AC_CHECK_FUNCS_ONCE([isblank])
14  if test $ac_cv_func_isblank = no; then
15    HAVE_ISBLANK=0
16  fi
17])
18