Fix missing include for file i/o prototypes after header cleanup in change 489dca71cd...

diff --git a/src/ServerSocket.cpp b/src/ServerSocket.cpp
index ece3549a81df056f5b1ce900ae65922b465a5166..fd903ce18fa4f69898da1516ae4d2acb5b2b2602 100644 (file)
--- a/src/ServerSocket.cpp
+++ b/src/ServerSocket.cpp
@@ -39,6 +39,10 @@
 # include <io.h>
 #endif
 
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
 using namespace std;
 using namespace lyx::support;