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### configure.ac					-*- Autoconf -*-
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### configure.ac					-*- Autoconf -*-
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###
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###
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### Process this file with autoconf to produce a configure script.
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### Process this file with autoconf to produce a configure script.
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###
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###
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### Copyright (C) 1998-2025 R Core Team
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### Copyright (C) 1998-2026 R Core Team
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###
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###
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### This file is part of R.
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### This file is part of R.
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###
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###
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### R is free software; you can redistribute it and/or modify it under
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### R is free software; you can redistribute it and/or modify it under
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### the terms of the GNU General Public License as published by the Free
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### the terms of the GNU General Public License as published by the Free
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AC_ARG_WITH([C23],
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AC_ARG_WITH([C23],
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[AS_HELP_STRING([--with-C23],[use C23 if available @<:@yes@:>@])],
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[AS_HELP_STRING([--with-C23],[use C23 if available @<:@yes@:>@])],
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[R_ARG_USE(C23)],
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[R_ARG_USE(C23)],
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[use_C23=yes])
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[use_C23=yes])
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- 
 
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dnl Made the default in R 4.6.0.
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AC_ARG_WITH([CXX20],
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AC_ARG_WITH([CXX20],
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[AS_HELP_STRING([--with-CXX20],[make C++20 the default C++ standard if available @<:@no@:>@])],
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[AS_HELP_STRING([--with-CXX20],[make C++20 the default C++ standard if available @<:@yes@:>@])],
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[R_ARG_USE(CXX20)],
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[R_ARG_USE(CXX20)],
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[use_CXX20=no])
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[use_CXX20=yes])
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## Build separate shared/dynamic library containing R's BLAS if desired
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## Build separate shared/dynamic library containing R's BLAS if desired
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AC_ARG_ENABLE([BLAS-shlib],
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AC_ARG_ENABLE([BLAS-shlib],
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[AS_HELP_STRING([--enable-BLAS-shlib],[build BLAS into a shared/dynamic library @<:@perhaps@:>@])],
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[AS_HELP_STRING([--enable-BLAS-shlib],[build BLAS into a shared/dynamic library @<:@perhaps@:>@])],
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[use_blas_shlib="${enableval}"],
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[use_blas_shlib="${enableval}"],