--- qsampler/trunk/src/qsampler.cpp	2011/11/13 20:29:46	2282
+++ qsampler/trunk/src/qsampler.cpp	2012/04/08 19:40:42	2341
@@ -278,6 +278,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <signal.h>
+#include <unistd.h>
 #include <sys/wait.h>
 
 void stacktrace ( int signo )