~/cryptography/src $ rustc --print target-list
aarch64-apple-darwin
aarch64-apple-ios
aarch64-apple-ios-macabi
aarch64-apple-ios-sim
aarch64-apple-tvos
aarch64-fuchsia
aarch64-kmc-solid_asp3
aarch64-linux-android
aarch64-pc-windows-msvc
aarch64-unknown-freebsd
aarch64-unknown-hermit
aarch64-unknown-linux-gnu
aarch64-unknown-linux-gnu_ilp32
aarch64-unknown-linux-musl
aarch64-unknown-netbsd
aarch64-unknown-none
aarch64-unknown-none-softfloat
aarch64-unknown-openbsd
aarch64-unknown-redox
aarch64-unknown-uefi
aarch64-uwp-windows-msvc
aarch64-wrs-vxworks
aarch64_be-unknown-linux-gnu
aarch64_be-unknown-linux-gnu_ilp32
arm-linux-androideabi
arm-unknown-linux-gnueabi
arm-unknown-linux-gnueabihf
arm-unknown-linux-musleabi
arm-unknown-linux-musleabihf
armebv7r-none-eabi
armebv7r-none-eabihf
armv4t-unknown-linux-gnueabi
armv5te-unknown-linux-gnueabi
armv5te-unknown-linux-musleabi
armv5te-unknown-linux-uclibceabi
armv6-unknown-freebsd
armv6-unknown-netbsd-eabihf
armv6k-nintendo-3ds
armv7-apple-ios
armv7-linux-androideabi
armv7-unknown-freebsd
armv7-unknown-linux-gnueabi
armv7-unknown-linux-gnueabihf
armv7-unknown-linux-musleabi
armv7-unknown-linux-musleabihf
armv7-unknown-linux-uclibceabihf
armv7-unknown-netbsd-eabihf
armv7-wrs-vxworks-eabihf
armv7a-kmc-solid_asp3-eabi
armv7a-kmc-solid_asp3-eabihf
armv7a-none-eabi
armv7a-none-eabihf
armv7r-none-eabi
armv7r-none-eabihf
armv7s-apple-ios
asmjs-unknown-emscripten
avr-unknown-gnu-atmega328
bpfeb-unknown-none
bpfel-unknown-none
hexagon-unknown-linux-musl
i386-apple-ios
i586-pc-windows-msvc
i586-unknown-linux-gnu
i586-unknown-linux-musl
i686-apple-darwin
i686-linux-android
i686-pc-windows-gnu
i686-pc-windows-msvc
i686-unknown-freebsd
i686-unknown-haiku
i686-unknown-linux-gnu
i686-unknown-linux-musl
i686-unknown-netbsd
i686-unknown-openbsd
i686-unknown-uefi
i686-uwp-windows-gnu
i686-uwp-windows-msvc
i686-wrs-vxworks
m68k-unknown-linux-gnu
mips-unknown-linux-gnu
mips-unknown-linux-musl
mips-unknown-linux-uclibc
mips64-unknown-linux-gnuabi64
mips64-unknown-linux-muslabi64
mips64el-unknown-linux-gnuabi64
mips64el-unknown-linux-muslabi64
mipsel-sony-psp
mipsel-unknown-linux-gnu
mipsel-unknown-linux-musl
mipsel-unknown-linux-uclibc
mipsel-unknown-none
mipsisa32r6-unknown-linux-gnu
mipsisa32r6el-unknown-linux-gnu
mipsisa64r6-unknown-linux-gnuabi64
mipsisa64r6el-unknown-linux-gnuabi64
msp430-none-elf
nvptx64-nvidia-cuda
powerpc-unknown-freebsd
powerpc-unknown-linux-gnu
powerpc-unknown-linux-gnuspe
powerpc-unknown-linux-musl
powerpc-unknown-netbsd
powerpc-unknown-openbsd
powerpc-wrs-vxworks
powerpc-wrs-vxworks-spe
powerpc64-unknown-freebsd
powerpc64-unknown-linux-gnu
powerpc64-unknown-linux-musl
powerpc64-wrs-vxworks
powerpc64le-unknown-freebsd
powerpc64le-unknown-linux-gnu
powerpc64le-unknown-linux-musl
riscv32gc-unknown-linux-gnu
riscv32gc-unknown-linux-musl
riscv32i-unknown-none-elf
riscv32imac-unknown-none-elf
riscv32imc-esp-espidf
riscv32imc-unknown-none-elf
riscv64gc-unknown-linux-gnu
riscv64gc-unknown-linux-musl
riscv64gc-unknown-none-elf
riscv64imac-unknown-none-elf
s390x-unknown-linux-gnu
s390x-unknown-linux-musl
sparc-unknown-linux-gnu
sparc64-unknown-linux-gnu
sparc64-unknown-netbsd
sparc64-unknown-openbsd
sparcv9-sun-solaris
thumbv4t-none-eabi
thumbv6m-none-eabi
thumbv7a-pc-windows-msvc
thumbv7a-uwp-windows-msvc
thumbv7em-none-eabi
thumbv7em-none-eabihf
thumbv7m-none-eabi
thumbv7neon-linux-androideabi
thumbv7neon-unknown-linux-gnueabihf
thumbv7neon-unknown-linux-musleabihf
thumbv8m.base-none-eabi
thumbv8m.main-none-eabi
thumbv8m.main-none-eabihf
wasm32-unknown-emscripten
wasm32-unknown-unknown
wasm32-wasi
wasm64-unknown-unknown
x86_64-apple-darwin
x86_64-apple-ios
x86_64-apple-ios-macabi
x86_64-apple-tvos
x86_64-fortanix-unknown-sgx
x86_64-fuchsia
x86_64-linux-android
x86_64-pc-solaris
x86_64-pc-windows-gnu
x86_64-pc-windows-msvc
x86_64-sun-solaris
x86_64-unknown-dragonfly
x86_64-unknown-freebsd
x86_64-unknown-haiku
x86_64-unknown-hermit
x86_64-unknown-illumos
x86_64-unknown-l4re-uclibc
x86_64-unknown-linux-gnu
x86_64-unknown-linux-gnux32
x86_64-unknown-linux-musl
x86_64-unknown-netbsd
x86_64-unknown-none-hermitkernel
x86_64-unknown-none-linuxkernel
x86_64-unknown-openbsd
x86_64-unknown-redox
x86_64-unknown-uefi
x86_64-uwp-windows-gnu
x86_64-uwp-windows-msvc
x86_64-wrs-vxworks
~/cryptography/src $ export CARGO_BUILD_TARGET=aarch64-linux-android
~/cryptography/src $ pip install cryptography --no-binary cryptography
Collecting cryptography
  Using cached cryptography-36.0.0.tar.gz (571 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Requirement already satisfied: cffi>=1.12 in /data/data/com.termux/files/usr/lib/python3.10/site-packages (from cryptography) (1.15.0)
Requirement already satisfied: pycparser in /data/data/com.termux/files/usr/lib/python3.10/site-packages (from cffi>=1.12->cryptography) (2.21)
Building wheels for collected packages: cryptography
  Building wheel for cryptography (pyproject.toml) ... done
  Created wheel for cryptography: filename=cryptography-36.0.0-cp310-cp310-linux_aarch64.whl size=1704186 sha256=7c8febe840153cab53f1a2ac695baeee19229a68d292d6602ffb01e6a671d125
  Stored in directory: /data/data/com.termux/cache/pip/wheels/ce/9d/25/5924896234eb82ac8af98e29ce7fe8a2091f00f59b4cedb3dc
Successfully built cryptography
Installing collected packages: cryptography
Successfully installed cryptography-36.0.0
~/cryptography/src $