From c82fe8888aacfe784476112edd3878256d2e30bc Mon Sep 17 00:00:00 2001
From: Joshua Boyd <jdboyd@Joshua-Boyds-Mac-mini.local>
Date: Wed, 23 Mar 2016 17:54:41 -0400
Subject: [PATCH] Detect missing itimerspec on OSX.

Set define to compiler accordingly.

This fixes cmake on osx support.
---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e271e31..1d413e8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -193,6 +193,14 @@ if(NOT HAVE_SYS_TIME_H)
     endif(MSVC)
 endif(NOT HAVE_SYS_TIME_H)
 
+# OSX has sys/time.h, but it still lacks itimerspec
+if(HAVE_SYS_TIME_H)
+    check_struct_member("struct itimerspec" it_value "sys/time.h" HAVE_STRUCT_ITIMERSPEC_IT_VALUE)
+    if(NOT HAVE_STRUCT_ITIMERSPEC_IT_VALUE)
+        add_definitions(-DSTRUCT_ITIMERSPEC_DEFINITION_MISSING=1)
+        set(STRUCT_ITIMERSPEC_DEFINITION_MISSING 1)
+    endif(NOT HAVE_STRUCT_ITIMERSPEC_IT_VALUE)
+endif(HAVE_SYS_TIME_H)
 
 ###############################################################################
 # Check for integer types