Use the termux_error_exit shell function

packages/ffmpeg/build.sh

@@ -30,8 +30,7 @@ termux_step_configure () {
 		_ARCH=$TERMUX_ARCH
 		_EXTRA_CONFIGURE_FLAGS="--enable-neon"
 	else
-		echo "Unsupported arch $TERMUX_ARCH"
-		exit 1
+		termux_error_exit "Unsupported arch: $TERMUX_ARCH"
 	fi
 
 	# --disable-lzma to avoid problem with shared library clashes, see

packages/libvpx/build.sh

@@ -22,8 +22,7 @@ termux_step_configure () {
 		export LD=$CC
 		_CONFIGURE_TARGET="--target=x86_64-android-gcc"
 	else
-		echo "Unsupported arch: $TERMUX_ARCH"
-		exit 1
+		termux_error_exit "Unsupported arch: $TERMUX_ARCH"
 	fi
 
 	# For --disable-realtime-only, see

packages/picolisp/build.sh

@@ -32,8 +32,7 @@ termux_step_pre_configure() {
 		elif [ $TERMUX_ARCH = "x86_64" ]; then
 			export TERMUX_PKG_EXTRA_MAKE_ARGS=x86-64.linux
 		else
-			echo "Error: Unsupported arch: $TERMUX_ARCH"
-			exit 1
+			termux_error_exit "Unsupported arch: $TERMUX_ARCH"
 		fi
 		TERMUX_PKG_SRCDIR=$TERMUX_PKG_SRCDIR/src64
 	else