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-rw-r--r--src/os/macosx/osx_stdafx.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/os/macosx/osx_stdafx.h b/src/os/macosx/osx_stdafx.h
index 35cf21eee..9255ae3c0 100644
--- a/src/os/macosx/osx_stdafx.h
+++ b/src/os/macosx/osx_stdafx.h
@@ -8,6 +8,7 @@
/* We need to include this first as that "depends" on the compiler's setting
* of __LP64__. So before we define __LP64__ so it can be used. */
#include <sys/cdefs.h>
+#include <unistd.h>
/* __LP64__ only exists in 10.5 and higher */
#if defined(__APPLE__) && !defined(__LP64__)