Bug 1055113 - Unbreak non-unified build on FreeBSD after bug 988816. r=swu, r=jduell

netwerk/ipc/RemoteOpenFileChild.cpp

@@ -20,6 +20,10 @@
 // needed to alloc/free NSPR file descriptors
 #include "private/pprio.h"
 
+#if !defined(XP_WIN) && !defined(MOZ_WIDGET_COCOA)
+#include <unistd.h>
+#endif
+
 using namespace mozilla::ipc;
 
 namespace mozilla {