Looks like ios.h is buildtime-only header, and you cannot build julia without uv.h present in deps/libuv/include anyway, and ../../usr/include is some strange place unless you build in some very special place like /tmp/julia and you have /usr/

Author: 6e441f9c

src/support/ios.h

@@ -3,7 +3,7 @@
 
 #include <stdarg.h>
 #include <pthread.h>
-#include "../../usr/include/uv.h"
+#include "../../deps/libuv/include/uv.h"
 
 // this flag controls when data actually moves out to the underlying I/O
 // channel. memory streams are a special case of this where the data