Fix for SunOS4.

git-svn-id: svn://10.0.0.236/trunk@26933 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/network/protocol/file/mkfile.c

@@ -61,6 +61,10 @@ extern void ProcessCookiesAndTrustLabels( ActiveEntry *ce );
 #include "progress.h"
 #endif
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>  /* for SEEK_SET on some platforms */
+#endif
+
 /* for XP_GetString() */
 #include "xpgetstr.h"
 extern int XP_ALERT_OUTMEMORY;