Poll has long been broken on Mac OS X. Starting with 10.9 (darwin13) it now works correctly so this patch enables it there.

diff --git a/m4/curl-functions.m4 b/m4/curl-functions.m4
index fdf004b..0d65421 100644
--- a/m4/curl-functions.m4
+++ b/m4/curl-functions.m4
@@ -4729,7 +4729,7 @@ AC_DEFUN([CURL_CHECK_FUNC_POLL], [
   tst_allow_poll="unknown"
   #
   case $host_os in
- darwin*|interix*)
+ darwin[[123456789]].*|darwin10.*|darwin11.*|darwin12.*|interix*)
       dnl poll() does not work on these platforms
       dnl Interix: "does provide poll(), but the implementing developer must
       dnl have been in a bad mood, because poll() only works on the /proc

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