GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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/* mpz expression evaluation, simple part */
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/*
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Copyright 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include "gmp.h"
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#include "expr-impl.h"
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int
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mpexpr_va_to_var (void *var[], va_list ap)
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{
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  int   i = 0;
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  void  *v;
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  for (;;)
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    {
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      v = va_arg (ap, void *);
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      if (v == NULL)
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        break;
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      if (i >= MPEXPR_VARIABLES)
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        return MPEXPR_RESULT_BAD_VARIABLE;
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      var[i++] = v;
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    }
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  while (i < MPEXPR_VARIABLES)
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    var[i++] = NULL;
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  return MPEXPR_RESULT_OK;
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}
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