diff -u -r /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/sys/wait.h ./usr/include/sys/wait.h
--- /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/sys/wait.h	2014-10-14 22:53:49.000000000 -0400
+++ ./usr/include/sys/wait.h	2015-07-11 16:55:21.567042577 -0400
@@ -48,6 +48,8 @@
 extern pid_t  wait(int *);
 extern pid_t  waitpid(pid_t, int *, int);
 extern pid_t  wait4(pid_t, int *, int, struct rusage *);
+/* Termux addition: Add wait3() declaration used by busybox. Available in libc for 32-bit only. */
+static pid_t wait3(int* status, int options, struct rusage* rusage) { return wait4(-1, status, options, rusage); }
 
 /* Posix states that idtype_t should be an enumeration type, but
  * the kernel headers define P_ALL, P_PID and P_PGID as constant macros