--- zorba-2.2.0.orig/bin/debugger/process_listener.h	2012-03-21 01:56:17.000000000 +0100
+++ zorba-2.2.0/bin/debugger/process_listener.h	2012-05-30 22:01:19.336623357 +0200
@@ -22,6 +22,7 @@
 #ifdef ZORBA_HAVE_PTHREAD_H
 # include <pthread.h>
 # include <sys/wait.h>
+# include <unistd.h>
   typedef pthread_t ThreadId;
   typedef pid_t ProcessId;
   typedef int ExitCode;