Blame config/zlib.m4

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dnl A function to check if the system's zlib library should be used.  The
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dnl builtin zlib dnl is used by default unless the user configured with
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dnl --with-system-zlib.
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AC_DEFUN([AM_ZLIB],
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[
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  # Use the system's zlib library.
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  zlibdir="-L\$(top_builddir)/../zlib"
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  zlibinc="-I\$(top_srcdir)/../zlib"
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  AC_ARG_WITH(system-zlib,
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  [AS_HELP_STRING([--with-system-zlib], [use installed libz])],
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  if test x$with_system_zlib = xyes ; then
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    zlibdir=
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    zlibinc=
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  fi
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  )
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  AC_SUBST(zlibdir)
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  AC_SUBST(zlibinc)
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])