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# isblank.m4 serial 3
dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_ISBLANK],
[
dnl Persuade glibc <ctype.h> to declare isblank().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([isblank])
if test $ac_cv_func_isblank = no; then
HAVE_ISBLANK=0
fi
])
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