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