Check for mig(1), not just libdispatch

diff --git a/cf/dispatch.m4 b/cf/dispatch.m4
index 68b39fd48ae79e31a18276a86c7edbeb6d58227a..76c5f47ee6fcf46b6eabf4c34499eee7e265b82e 100644 (file)
--- a/cf/dispatch.m4
+++ b/cf/dispatch.m4
@@ -1,20 +1,23 @@
 
 AC_DEFUN([rk_LIBDISPATCH],[
 
-AC_CHECK_HEADERS([dispatch/dispatch.h])
+AC_CHECK_PROGS(GCD_MIG, mig, no)
 
-AC_FIND_FUNC_NO_LIBS(dispatch_async_f, dispatch,
-[#ifdef HAVE_DISPATCH_DISPATCH_H
-#include <dispatch/dispatch.h>
-#endif],[0,0,0])
+if test "$GCD_MIG" != no; then
+  AC_CHECK_HEADERS([dispatch/dispatch.h])
+  AC_FIND_FUNC_NO_LIBS(dispatch_async_f, dispatch,
+  [#ifdef HAVE_DISPATCH_DISPATCH_H
+  #include <dispatch/dispatch.h>
+  #endif],[0,0,0])
 
-if test "$ac_cv_func_dispatch_async_f" = yes ; then
-    AC_DEFINE([HAVE_GCD], 1, [Define if os support gcd.])
-    libdispatch=yes
-else
-    libdispatch=no
-fi
+  if test "$ac_cv_func_dispatch_async_f" = yes -a "$GCD_MIG" != no; then
+      AC_DEFINE([HAVE_GCD], 1, [Define if os support gcd.])
+      libdispatch=yes
+  else
+      libdispatch=no
+  fi
 
-AM_CONDITIONAL(have_gcd, test "$libdispatch" = yes)
+fi
+AM_CONDITIONAL(have_gcd, test "$libdispatch" = yes -a "$GCD_MIG" != no)
 
-])
\ No newline at end of file
+])