diff --git a/extendedcommands.h b/extendedcommands.h
index 8a5a1f2..65b1a7a 100644
--- a/extendedcommands.h
+++ b/extendedcommands.h
@@ -34,3 +34,5 @@
 int
 install_zip(const char* packagefilepath);
 
+int
+__system(const char *command);