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      2 AC_DEFUN([rk_LIBDISPATCH],[
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      4 AC_CHECK_PROGS(GCD_MIG, mig, no)
      5 
      6 if test "$GCD_MIG" != no; then
      7   AC_CHECK_HEADERS([dispatch/dispatch.h])
      8   AC_FIND_FUNC_NO_LIBS(dispatch_async_f, dispatch,
      9   [#ifdef HAVE_DISPATCH_DISPATCH_H
     10   #include <dispatch/dispatch.h>
     11   #endif],[0,0,0])
     12 
     13   if test "$ac_cv_func_dispatch_async_f" = yes -a "$GCD_MIG" != no; then
     14       AC_DEFINE([HAVE_GCD], 1, [Define if os support gcd.])
     15       libdispatch=yes
     16   else
     17       libdispatch=no
     18   fi
     19 
     20 fi
     21 AM_CONDITIONAL(have_gcd, test "$libdispatch" = yes -a "$GCD_MIG" != no)
     22 
     23 ])
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