Requirements:

Download the Android NDK:

Android NDK r21e (Linux x86_64)

Install dependencies for cross-compiling:

sudo apt update
sudo apt install -y \
    autoconf \
    automake \
    bison \
    bc \
    build-essential \
    clang \
    cpio \
    cmake \
    cmake-format \
    curl \
    debhelper \
    debhelper-compat \
    device-tree-compiler \
    dpkg-dev \
    dwarves \
    file \
    fakeroot \
    flex \
    g++ \
    g++-multilib \
    git \
    gawk \
    gettext \
    libdb-dev \
    libelf-dev \
    libffi-dev \
    libgmp-dev \
    liblzma-dev \
    libmpc-dev \
    libmpfr-dev \
    libncurses-dev \
    libncurses5-dev \
    libssl-dev \
    libtool \
    make \
    ninja-build \
    patch \
    pkg-config \
    python3 \
    python3-pip \
    python3-setuptools \
    rsync \
    unzip \
    wget \
    xsltproc \
    zip \
    zlib1g-dev

export NDK=/root/android-ndk-r21e
export API=29

export CC="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android29-clang"
export CXX="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android29-clang++"
export AR="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar"
export RANLIB="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ranlib"
export LD="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/ld.lld"
export STRIP="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip"


# Compile Zlib
wget https://zlib.net/zlib-1.3.1.tar.gz
tar -xf zlib-1.3.1.tar.gz
rm -rf zlib-1.3.1.tar.gz

cd zlib-1.3.1

./configure \
  --static \
  --prefix=/root/static_prefix

make -j$(nproc)
make install
cd ..
  
# Compile libpcap
git clone https://github.com/the-tcpdump-group/libpcap.git 
cd libpcap

./autogen.sh

./configure \
  --host=aarch64-linux-android \
  --build=x86_64-pc-linux-gnu \
  --disable-shared \
  CC="$CC" AR="$AR" RANLIB="$RANLIB" STRIP="$STRIP" \
  CFLAGS="-D__ANDROID_API__=$API" \
  --prefix=/root/static_prefix
  
make -j$(nproc)
make install

cd ..

# Compile tcpdump
git clone https://github.com/the-tcpdump-group/tcpdump.git 
cd tcpdump

export CFLAGS="-fPIC -I/root/static_prefix/include"
export LDFLAGS="-L/root/static_prefix/lib"
export PKG_CONFIG_LIBDIR=/root/static_prefix/lib/pkgconfig
export PKG_CONFIG_PATH=/root/static_prefix/lib/pkgconfig
./autogen.sh

./configure \
  --host=aarch64-linux-android \
  --build=x86_64-pc-linux-gnu \
  CC="$CC" AR="$AR" RANLIB="$RANLIB" STRIP="$STRIP" \
  CFLAGS="-D__ANDROID_API__=$API" \
  PKG_CONFIG_PATH=/root/static_prefix/lib/pkgconfig \
  --prefix=/root/static_prefix
  
  
make -j$(nproc)
make install

cd ..

# Compile

git clone https://github.com/t6x/reaver-wps-fork-t6x.git

cd reaver-wps-fork-t6x

export NDK=/root/android-ndk-r21e
export API=29
export ARCH=aarch64
export CC="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/${ARCH}-linux-android${API}-clang"
export AR="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar"
export LD="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/ld"
export RANLIB="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ranlib"
export STRIP="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip"

# remove pthread/rt, force only libc
export LIBS="-lc"

./configure \
  --host=aarch64-linux-android \
  --build=x86_64-pc-linux-gnu \
  CC="$CC" AR="$AR" RANLIB="$RANLIB" STRIP="$STRIP" LD="$LD" \
  --prefix=/root/static_prefix \
  CFLAGS="-I/root/static_prefix/include -O2 -fPIE -fPIC" \
  PKG_CONFIG_PATH=/root/static_prefix/lib/pkgconfig \
  LDFLAGS="-L/root/static_prefix/lib -pie" \
  LIBS="$LIBS"

sed -i 's/-lpthread//g; s/-lrt//g' Makefile

make -j$(nproc)
make install

cd ..