Cross compile protobuf and protobuf-c for Android ARM64

compile_protobuf-c_android.sh

#!/usr/bin/env bash

export NDK_ROOT=/Users/"$(whoami)"/android-sdk/ndk-bundle
export ANDROID_NDK=${NDK_ROOT}
export ANDROID_NDK_ROOT=${NDK_ROOT}
export CXXSTL=$NDK_ROOT/sources/cxx-stl/gnu-libstdc++
export ARCH="arm64-v8a"  
export CFLAGS="-DANDROID -fpermissive -Wno-format -fPIC -fPIE -pie -g -O2 -I../protobuf/arm64build/include"
export LDFLAGS="-Wl,--allow-shlib-undefined -fPIC -fPIE -pie -L$CXXSTL/libs/arm64-v8a/include -static-libstdc++ -L../protobuf/arm64build/lib"
export CXXFLAGS="-std=c++03 -Wno-c++11-long-long -Wno-c++11-extensions -I$CXXSTL/include $CFLAGS"
export CC="aarch64-linux-android-clang"
export CXX="aarch64-linux-android-clang++"
export AR="aarch64-linux-android-ar"  
export RANLIB="aarch64-linux-android-ranlib"
export STRIP="aarch64-linux-android-strip --strip-unneeded"  
export READELF="aarch64-linux-android-readelf"  
export MAKE="make -j4 CROSS_COMPILE_TARGET=yes"

rm -rf arm64build/
rm Makefile.in
rm config.in
make clean

echo "Configuring protobuf-c ..."

./autogen.sh

./configure --host=aarch64-linux-android --target=aarch64-linux-android --build=x86_64-apple-darwin \
            --prefix=$(pwd)/arm64build \
            CFLAGS="$CFLAGS" \
            LDFAGS="$LDFLAGS" \
            CXXFLAGS="$CXXFLAGS" \
            protobuf_CXXFLAGS="$CXXFLAGS" \
            protobuf_CFLAGS="$CFLAGS" \
            protobuf_LIBS="$LDFLAGS" \
            ac_cv_c_bigendian=no

echo "Making protobuf-c ..."

$MAKE

echo "Installing protobuf-c to build directory ..."

make install

compile_protobuf_android.sh

#!/usr/bin/env bash

export NDK_ROOT=/Users/"$(whoami)"/android-sdk/ndk-bundle
export ANDROID_NDK=${NDK_ROOT}
export ANDROID_NDK_ROOT=${NDK_ROOT}
export CXXSTL=$NDK_ROOT/sources/cxx-stl/gnu-libstdc++
export ARCH="arm64-v8a"  
export CFLAGS="-DANDROID -fpermissive -Wno-format -fPIC -fPIE -pie -g -O2"
export LDFLAGS="-Wl,--allow-shlib-undefined -fPIC -fPIE -pie -L$CXXSTL/libs/arm64-v8a/include -static-libstdc++"
export CXXFLAGS="-std=c++11 -I$CXXSTL/include $CFLAGS"
export CC="aarch64-linux-android-clang"  
export CXX="aarch64-linux-android-clang++"
export AR="aarch64-linux-android-ar"  
export RANLIB="aarch64-linux-android-ranlib"
export STRIP="aarch64-linux-android-strip --strip-unneeded"  
export READELF="aarch64-linux-android-readelf"  
export MAKE="make -j4 CROSS_COMPILE_TARGET=yes"  

rm -rf arm64build/
rm Makefile.in
make clean

echo "Configuring protobuf ..."

./autogen.sh

./configure --host=aarch64-linux-android --build=x86_64-apple-darwin \
			--with-sysroot=$SYSROOT \
			--enable-cross-compile \
            --prefix=$(pwd)/arm64build \
            --with-protoc=protoc

echo "Making protobuf ..."

$MAKE

echo "Installing protobuf to build directory ..."

make install

z_bash_profile

export NDK_ROOT=/Users/user/android-sdk/ndk-bundle
export ANDROID_NDK=${NDK_ROOT}
export ANDROID_SDK=/Users/user/android-sdk
export ANDROID_API24_TOOLCHAIN=/Users/user/android-arm64-api24-toolchain
export SYSROOT=$ANDROID_API24_TOOLCHAIN/sysroot
export PATH=/Users/user/android-sdk/platform-tools:$NDK_ROOT:$ANDROID_API24_TOOLCHAIN/bin:$PATH

Tried this script to cross-compile protobuf-3.4.1 on ubuntu for arm64(android-api 26) but getting multiple errors about strchr, memchr, strpbrk being undeclared identifiers.