diff -urN ../busybox-1.25.1.orig/libbb/missing_syscalls.c ./libbb/missing_syscalls.c
--- ../busybox-1.25.1.orig/libbb/missing_syscalls.c	2016-09-27 19:53:50.000000000 +0300
+++ ./libbb/missing_syscalls.c	2016-10-19 13:52:02.506463230 +0300
@@ -46,4 +46,14 @@
 	return ioctl(fd, TCSBRK, 1);
 }
 # endif
+
+int swapoff(const char *path)
+{
+  return syscall(__NR_swapoff, path);
+}
+
+int swapon(const char *path, int swapflags)
+{
+  return syscall(__NR_swapon, path, swapflags);
+}
 #endif