These are Bash 5.0 sources with a minor patchset, which configures the prompt line using Android-specific environment bits.

The instructions below assume armv7. You may need to adjust the compiler to target armv8 (arm64) variant.

• Obtain GCC ARM cross toolchain:

sudo apt install gcc-arm-linux-gnueabi

• Build Bash with static linking:

git clone https://github.com/dmikushin/bash-anrdoid.git
cd bash-android
mkdir build
cd build
../configure --prefix=$(pwd)/../install --host=arm-linux-gnueabi --enable-static-link
make -j12

Install the resulting binary with ADB/MTP (the /system partition must be writable):

cd build
adb push ./bash /system/bin/bash