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-rw-r--r--libcxx/include/__config4
1 files changed, 4 insertions, 0 deletions
diff --git a/libcxx/include/__config b/libcxx/include/__config
index ab066d88993..afef5936cbc 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -19,6 +19,10 @@
#define _GNUC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
#endif
+#if !_WIN32
+#include <unistd.h>
+#endif
+
#define _LIBCPP_VERSION 1101
#define _LIBCPP_ABI_VERSION 1
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