Index: source/Host/posix/PipePosix.cpp
===================================================================
--- source/Host/posix/PipePosix.cpp
+++ source/Host/posix/PipePosix.cpp
@@ -14,8 +14,10 @@
 #include "llvm/Support/FileSystem.h"
 
 #if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8))
+#ifndef _GLIBCXX_USE_NANOSLEEP
 #define _GLIBCXX_USE_NANOSLEEP
 #endif
+#endif
 
 #include <functional>
 #include <thread>