Add Optional::value_or

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index 9c65c650c14f2b68496028ffedbc13d185902e3d..61b9eb22ff30234b47d969fffddf01ad6e6409b7 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -173,6 +173,7 @@ struct MaxAlign { char c; } __attribute__((aligned));
 // the 'std' namespace; the latter uses inline namepsaces. Wrap this decision
 // up in a macro to make forward-declarations easier.
 #if FOLLY_USE_LIBCPP
+#include <__config>
 #define FOLLY_NAMESPACE_STD_BEGIN     _LIBCPP_BEGIN_NAMESPACE_STD
 #define FOLLY_NAMESPACE_STD_END       _LIBCPP_END_NAMESPACE_STD
 #else