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a/src/configure.ac b/src/configure.ac
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# Enable use of threads in the indexing pipeline.  
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# Enable use of threads in the indexing pipeline.  
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# This is disabled by default as we usually care little about indexing 
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# This is disabled by default as we usually care little about indexing 
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# absolute performance (more about impact on usability and total 
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# absolute performance (more about impact on usability and total 
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# resources used).
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# resources used).
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AC_ARG_ENABLE(idxthreads,
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AC_ARG_ENABLE(idxthreads,
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    AC_HELP_STRING([--enable-idxthreads],
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    AC_HELP_STRING([--disable-idxthreads],
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   [Enable multithread indexing. This can somewhat boost indexing 
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   [Disable multithread indexing.]),
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   performance.]),
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        idxthreadsEnabled=$enableval, idxthreadsEnabled=no)
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        idxthreadsEnabled=$enableval, idxthreadsEnabled=yes)
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if test X$idxthreadsEnabled = Xyes ; then
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if test X$idxthreadsEnabled = Xyes ; then
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  AC_DEFINE(IDX_THREADS, 1, [Use multiple threads for indexing])
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  AC_DEFINE(IDX_THREADS, 1, [Use multiple threads for indexing])
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  NOTHREADS=""
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  NOTHREADS=""
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else
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else