Patch TCSAFLUSH to be TCSANOW

build-package.sh

@@ -431,7 +431,7 @@ termux_step_start_build() {
 	TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_COMMON_CACHEDIR/${TERMUX_NDK_VERSION}-${TERMUX_ARCH}-${TERMUX_PKG_API_LEVEL}"
 	# Bump the below version if a change is made in toolchain setup to ensure
 	# that everyone gets an updated toolchain:
-	TERMUX_STANDALONE_TOOLCHAIN+="-v1"
+	TERMUX_STANDALONE_TOOLCHAIN+="-v2"
 
 	if [ -n "${TERMUX_PKG_BLACKLISTED_ARCHES:=""}" ] && [ "$TERMUX_PKG_BLACKLISTED_ARCHES" != "${TERMUX_PKG_BLACKLISTED_ARCHES/$TERMUX_ARCH/}" ]; then
 		echo "Skipping building $TERMUX_PKG_NAME for arch $TERMUX_ARCH"

ndk-patches/asm-generic-termbits.h.patch

@@ -0,0 +1,11 @@
+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