-In Termux login_tty() is implemented in the libutil package to support android-21.
-
diff -u -r /home/fornwall/lib/android-ndk/sysroot/usr/include/utmp.h ./usr/include/utmp.h
---- /home/fornwall/lib/android-ndk/sysroot/usr/include/utmp.h 2017-06-20 17:41:56.000000000 +0200
-+++ ./usr/include/utmp.h 2017-07-10 09:47:42.422659110 +0200
-@@ -101,11 +101,7 @@
+--- /home/fornwall/lib/android-ndk/sysroot/usr/include/utmp.h 2017-11-09 09:57:12.000000000 +0100
++++ ./usr/include/utmp.h 2017-11-15 12:01:37.108811692 +0100
+@@ -101,11 +101,8 @@
struct utmp* getutent(void);
void endutent(void);
-
-#if __ANDROID_API__ >= 23
--int login_tty(int) __INTRODUCED_IN(23);
+-int login_tty(int __fd) __INTRODUCED_IN(23);
-#endif /* __ANDROID_API__ >= 23 */
-
-+int login_tty(int);
++/* In Termux login_tty() is implemented in the libutil package to support android-21. */
++int login_tty(int __fd);
__END_DECLS