fix simulator build
diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index 80c8ee4..c8c142d 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -21,6 +21,7 @@
 #include <math.h>
 #include <fcntl.h>
 #include <utils/misc.h>
+#include <signal.h>
 
 #include <binder/IPCThreadState.h>
 #include <utils/threads.h>