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# isblank.m4 serial 3
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dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_ISBLANK],
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[
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dnl Persuade glibc <ctype.h> to declare isblank().
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
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AC_CHECK_FUNCS_ONCE([isblank])
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if test $ac_cv_func_isblank = no; then
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HAVE_ISBLANK=0
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fi
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])
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