diff -u -r /home/builder/lib/android-ndk/sysroot/usr/include/asm-generic/termbits.h ./usr/include/asm-generic/termbits.h
--- /home/builder/lib/android-ndk/sysroot/usr/include/asm-generic/termbits.h	2018-09-10 17:37:50.000000000 +0000
+++ ./usr/include/asm-generic/termbits.h	2019-01-16 04:54:01.117253378 +0000
@@ -190,5 +190,6 @@
 #define TCIOFLUSH 2
 #define TCSANOW 0
 #define TCSADRAIN 1
-#define TCSAFLUSH 2
+/* TCSAFLUSH is patched to be TCSANOW in Termux to work around Android SELinux rule */
+#define TCSAFLUSH 0
 #endif
--- ./usr/include/bits/termios_inlines.h.orig	2021-08-16 17:05:16.001067630 +0200
+++ ./usr/include/bits/termios_inlines.h	2021-08-16 17:05:05.851074187 +0200
@@ -117,7 +117,6 @@
   switch (optional_actions) {
     case TCSANOW: cmd = TCSETS; break;
     case TCSADRAIN: cmd = TCSETSW; break;
-    case TCSAFLUSH: cmd = TCSETSF; break;
     default: errno = EINVAL; return -1;
   }
   return ioctl(fd, cmd, s);