Adding swapon and swapoff
diff --git a/toys.h b/toys.h
index 5ed8089..504e0dc 100644
--- a/toys.h
+++ b/toys.h
@@ -29,6 +29,7 @@
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/sysinfo.h>
+#include <sys/swap.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>