Add troubleshooting section

docs/announce/2014.12.md

@@ -76,3 +76,19 @@ be used with the Rakudo compiler to enhance its utility.  Rakudo Star
 is meant for early adopters who wish to explore what's possible with
 Rakudo Perl 6 and provide feedback on what works, what doesn't, and
 what else they would like to see included in the distribution.
+
+# Troubleshooting
+It appears that on OS X, the build will sometimes fail with a message like:
+
+  .../install/include/libuv/uv-darwin.h:26:11: fatal error: 
+        'mach/mach.h' file not found
+
+The only solution found to fix this so far, has been:
+
+  $ cd install/include/libuv
+  $ ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/mach
+  $ cd ../../..
+  $ # run make again
+
+Note that the 10.9 in the above, represents the major version of OS X being
+used.  On Mavericks use 10.9 (like above), on Yosemite use 10.10.