diff --git a/etc/nix/fdroid.nix b/etc/nix/fdroid.nix
index 6af7a6a..291c92c 100644
--- a/etc/nix/fdroid.nix
+++ b/etc/nix/fdroid.nix
@@ -18,12 +18,10 @@ let
     pyasn1
     pyasn1-modules
     python-vagrant
-    libvirt
     pyyaml
     qrcode
     requests
     ruamel_yaml
-    libvirt
   ]
 
 ; python-with-fdroid-packages = pkgs.python3.withPackages fdroid-python-packages
diff --git a/etc/nix/shell.nix b/etc/nix/shell.nix
index 412b615..c8abbcd 100644
--- a/etc/nix/shell.nix
+++ b/etc/nix/shell.nix
@@ -33,12 +33,102 @@ let
     xkeyboard_config
   ]
 
+; ndk-r17c = (nixpkgs.androidenv.composeAndroidPackages
+  {
+    ndkVersion = "17.2.4988734"
+  ; }).ndk-bundle
+
+; ndk-r21b =
+    let
+      version = "r21b"
+    ; in
+    nixpkgs.fetchzip
+    {
+      url = "https://dl.google.com/android/repository/android-ndk-${version}-linux-x86_64.zip"
+    ; sha256 = "0shz45b6f2k4lnca8fgghh4cdh53vghfn26cj4mkirkk4cpv1qry"
+    ; }
+
+; openssl-source =
+    let
+      name = "openssl"
+    ; version = "1.1.1g"
+    ; in
+    nixpkgs.fetchurl
+    {
+      url = "https://www.openssl.org/source/${name}-${version}.tar.gz"
+    ; sha256 = "0ikdcc038i7jk8h7asq5xcn8b1xc2rrbc88yfm4hqbz3y5s4gc6x"
+    ; }
+
+; iconv-source =
+    let
+      name = "libiconv"
+    ; version = "1.16"
+    ; in
+    nixpkgs.fetchurl
+    {
+      url = "http://ftp.gnu.org/pub/gnu/${name}/${name}-${version}.tar.gz"
+    ; sha256 = "016c57srqr0bza5fxjxfrx6aqxkqy0s3gkhcg7p7fhk5i6sv38g6"
+    ; }
+
+; boost-source =
+    let
+      name = "boost"
+    ; version = "1_71_0"
+    ; dot_version = "1.71.0"
+    ; in
+    nixpkgs.fetchurl
+    {
+      url =
+      "https://dl.bintray.com/boostorg/release/{dot_version}/source/${name}_${version}.tar.bz2"
+    ; sha256 = "1vi40mcair6xgm9k8rsavyhcia3ia28q8k0blknwgy4b3sh8sfnp"
+    ; }
+
+; sodium-source =
+    let
+      name = "libsodium"
+    ; version = "1.0.18"
+    ; in
+    nixpkgs.fetchurl
+    {
+      url = "https://github.com/jedisct1/${name}/archive/${version}.tar.gz"
+    ; sha256 = "1x6lll81z4ah732zwpw481qfbzg7yml0nwdgbnd5388jnz3274ym"
+    ; }
+
+; randomwow-source =
+    let
+      name = "RandomWOW"
+    ; version = "1.1.6"
+    ; in
+    nixpkgs.fetchurl
+    {
+      url = "https://github.com/wownero/${name}/archive/${version}.tar.gz"
+    ; sha256 = "1c55y2dwrayh6k1avpchs89gq1mvy5c305h92jm2k48kzhw6a792"
+    ; }
+
+; wownero-source =
+    nixpkgs.fetchFromGitHub
+    {
+      owner = "fuwa0529"
+    ; repo = "wownero"
+    ; rev = "8ca7e3"
+    ; sha256 = "07h8wiq8qm70m2s8bpalzx0fbrjl66khlha4qyfmpidpgv92daa6"
+    ; }
+
+; miniupnp-source =
+    nixpkgs.fetchFromGitHub
+    {
+      owner = "miniupnp"
+    ; repo = "miniupnp"
+    ; rev = "7800de9"
+    ; sha256 = "1f7jgll8lxz2l5lifgqafgx8694x0svgwyz8w8w4cwavm9lmah63"
+    ; }
+
 ; in
 
 with nixpkgs;
 
 (buildFHSUserEnv {
-  name = "cyberwow-build-env"
+  name = "cyberwow-env"
 ; targetPkgs = pkgs: (with pkgs;
   [
     bash
@@ -58,7 +148,7 @@ with nixpkgs;
     gnumake
     gcc
     entr
-    androidenv.androidPkgs_9_0.platform-tools
+    # androidenv.androidPkgs_9_0.platform-tools
 
 
     zlib
@@ -70,6 +160,7 @@ with nixpkgs;
     gnum4
     pkgconfig
     cmake
+    ccache
   ]
   ++ android-studio-deps
   )
@@ -87,10 +178,19 @@ with nixpkgs;
     PATH=~/SDK/Android/Sdk/tools/bin:$PATH
 
     export ANDROID_NDK_VERSION=r21b
-    export ANDROID_NDK_ROOT=~/SDK/Android/ndk-archive/android-ndk-$ANDROID_NDK_VERSION
+    export ANDROID_NDK_ROOT=${ndk-r21b}
     export NDK=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64
     PATH=$NDK/bin:$PATH
 
+    export SRC_OPENSSL=${openssl-source}
+    export SRC_ICONV=${iconv-source}
+    export SRC_BOOST=${boost-source}
+    export SRC_SODIUM=${sodium-source}
+    export SRC_RANDOMWOW=${randomwow-source}
+    export SRC_MINIUPNP_DIR=${miniupnp-source}
+    export SRC_RAPIDJSON_DIR=${nixpkgs.rapidjson.src}
+    export SRC_WOWNERO_DIR=${wownero-source}
+
     export PATH_NCURSES=${nixpkgs.ncurses5}
     export PATH
 
@@ -98,7 +198,7 @@ with nixpkgs;
     export DART_VM_OPTIONS=--root-certs-file=/etc/ssl/certs/ca-certificates.crt
 
     export ANDROID_NDK_VERSION_WOW=r17c
-    export ANDROID_NDK_ROOT_WOW=~/SDK/Android/ndk-archive/android-ndk-$ANDROID_NDK_VERSION_WOW
+    export ANDROID_NDK_ROOT_WOW=${ndk-r17c}/libexec/android-sdk/ndk-bundle
 
     export ZSH_INIT=${nixpkgs.oh-my-zsh}/share/oh-my-zsh/oh-my-zsh.sh
     exec zsh
diff --git a/etc/scripts/build-external-libs/boost/build.sh b/etc/scripts/build-external-libs/boost/build.sh
index 8df015b..3a2dd40 100755
--- a/etc/scripts/build-external-libs/boost/build.sh
+++ b/etc/scripts/build-external-libs/boost/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
@@ -66,33 +66,42 @@ for arch in ${archs[@]}; do
     echo "building for ${arch}"
 
     (
-        PATH=$build_root/tool/$arch/$target_host/bin:$build_root/tool/$arch/bin:$PATH \
-            CC=clang \
-            CXX=clang++; \
-            ./b2 \
-                cxxstd=14 \
-                toolset=clang \
-                threading=multi \
-                threadapi=pthread \
-                link=static \
-                runtime-link=static \
-                target-os=android \
-                --ignore-site-config \
-                --prefix=${PREFIX} \
-                --build-dir=android \
-                -sICONV_PATH=${ICONV_PATH} \
-                --build-type=minimal \
-                --with-chrono \
-                --with-date_time \
-                --with-filesystem \
-                --with-program_options \
-                --with-regex \
-                --with-serialization \
-                --with-system \
-                --with-thread \
-                --with-locale \
-                install \
-                -j${NPROC} \
+        PATH=$build_root/tool/$arch/$target_host/bin:$build_root/tool/$arch/bin:$PATH
+        if [ -x "$(command -v ccache)" ]; then
+            echo "////////////////////////////////////////////"
+            echo "//              CCACHE 1                  //"
+            echo "////////////////////////////////////////////"
+            CC="ccache clang"
+            CXX="ccache clang++"
+        else
+            CC=clang
+            CXX=clang++
+        fi
+
+        ./b2 \
+            cxxstd=14 \
+            toolset=clang \
+            threading=multi \
+            threadapi=pthread \
+            link=static \
+            runtime-link=static \
+            target-os=android \
+            --ignore-site-config \
+            --prefix=${PREFIX} \
+            --build-dir=android \
+            -sICONV_PATH=${ICONV_PATH} \
+            --build-type=minimal \
+            --with-chrono \
+            --with-date_time \
+            --with-filesystem \
+            --with-program_options \
+            --with-regex \
+            --with-serialization \
+            --with-system \
+            --with-thread \
+            --with-locale \
+            install \
+            -j${NPROC} \
     )
 
 done
diff --git a/etc/scripts/build-external-libs/boost/fetch.sh b/etc/scripts/build-external-libs/boost/fetch.sh
index 7e2e3c2..24c9ea6 100755
--- a/etc/scripts/build-external-libs/boost/fetch.sh
+++ b/etc/scripts/build-external-libs/boost/fetch.sh
@@ -39,12 +39,18 @@ name=boost
 version=1_71_0
 dot_version=1.71.0
 hash=d73a8da01e8bf8c7eda40b4c84915071a8c8a0df4a6734537ddde4a8580524ee
+url=https://dl.bintray.com/boostorg/release/${dot_version}/source/${name}_${version}.tar.bz2
+out=${name}_${version}.tar.bz2
 
 rm -rf ${name}_${version}
 
-curl -# -L -O \
-     https://dl.bintray.com/boostorg/release/${dot_version}/source/${name}_${version}.tar.bz2
+if [ -f $SRC_BOOST ]; then
+    echo "using pre-fetched $name"
+    cp $SRC_BOOST  $out
+else
+    curl -# -L -o $out -O $url
+fi
 
-echo "${hash} ${name}_${version}.tar.bz2" | sha256sum -c
+echo "$hash $out" | sha256sum -c
 
-tar xfv ${name}_${version}.tar.bz2
+tar xfv $out
diff --git a/etc/scripts/build-external-libs/clean.sh b/etc/scripts/build-external-libs/clean.sh
index ce8e991..cf34aab 100755
--- a/etc/scripts/build-external-libs/clean.sh
+++ b/etc/scripts/build-external-libs/clean.sh
@@ -35,7 +35,6 @@ source etc/scripts/build-external-libs/env.sh
 
 build_root=$BUILD_PATH
 
+chmod u+w -R $build_root
 rm -rf $build_root
 mkdir -p $build_root
-
-rm -rf cyberwow/native/output
diff --git a/etc/scripts/build-external-libs/collect-fake.sh b/etc/scripts/build-external-libs/collect-fake.sh
deleted file mode 100755
index 54f4e24..0000000
--- a/etc/scripts/build-external-libs/collect-fake.sh
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/bin/bash
-
-# Copyright (c) 2019, The Wownero Project
-# Copyright (c) 2014-2019, The Monero Project
-#
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without modification, are
-# permitted provided that the following conditions are met:
-#
-# 1. Redistributions of source code must retain the above copyright notice, this list of
-#    conditions and the following disclaimer.
-#
-# 2. Redistributions in binary form must reproduce the above copyright notice, this list
-#    of conditions and the following disclaimer in the documentation and/or other
-#    materials provided with the distribution.
-#
-# 3. Neither the name of the copyright holder nor the names of its contributors may be
-#    used to endorse or promote products derived from this software without specific
-#    prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
-# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
-# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
-# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-set -e
-
-source etc/scripts/build-external-libs/env.sh
-
-src_root=$BUILD_ROOT_SRC
-target_root=`pwd`
-
-mkdir -p $target_root/cyberwow/native/output/arm64
-touch $target_root/cyberwow/native/output/arm64/wownerod
-
-mkdir -p $target_root/cyberwow/native/output/x86_64
-touch $target_root/cyberwow/native/output/x86_64/wownerod
-
-exit 0
diff --git a/etc/scripts/build-external-libs/collect.sh b/etc/scripts/build-external-libs/collect.sh
index b7febda..9502e9f 100755
--- a/etc/scripts/build-external-libs/collect.sh
+++ b/etc/scripts/build-external-libs/collect.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
@@ -34,6 +34,7 @@ set -e
 source etc/scripts/build-external-libs/env.sh
 
 src_root=$BUILD_ROOT_SRC
+build_root=$BUILD_ROOT
 target_root=`pwd`
 
 name=wownero
@@ -62,7 +63,7 @@ for arch in ${archs[@]}; do
     echo "collecting for ${arch}"
     mkdir -p $target_root/cyberwow/android/app/src/main/jniLibs/$target_abi
     cp build/release/bin/wownerod \
-    $target_root/cyberwow/android/app/src/main/jniLibs/$target_abi/libwownerod.so
+      $target_root/cyberwow/android/app/src/main/jniLibs/$target_abi/libwownerod.so
 
 done
 
diff --git a/etc/scripts/build-external-libs/env.sh b/etc/scripts/build-external-libs/env.sh
index 4181414..0fee5fa 100644
--- a/etc/scripts/build-external-libs/env.sh
+++ b/etc/scripts/build-external-libs/env.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
 #
diff --git a/etc/scripts/build-external-libs/iconv/build.sh b/etc/scripts/build-external-libs/iconv/build.sh
index e7af77e..b57539c 100755
--- a/etc/scripts/build-external-libs/iconv/build.sh
+++ b/etc/scripts/build-external-libs/iconv/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
@@ -61,15 +61,24 @@ for arch in ${archs[@]}; do
     echo "building for ${arch}"
 
     (
-        PATH=$build_root/tool/$arch/$target_host/bin:$build_root/tool/$arch/bin:$PATH \
-            CC=clang \
-            CXX=clang++; \
-            ./configure \
-                --prefix=${PREFIX} \
-                --build=x86_64-linux-gnu \
-                --host=${target_host} \
-                --disable-rpath \
-                && make -j${NPROC} && make install && make clean \
+        PATH=$build_root/tool/$arch/$target_host/bin:$build_root/tool/$arch/bin:$PATH
+        if [ -x "$(command -v ccache)" ]; then
+            echo "////////////////////////////////////////////"
+            echo "//              CCACHE 1                  //"
+            echo "////////////////////////////////////////////"
+            CC="ccache clang"
+            CXX="ccache clang++"
+        else
+            CC=clang
+            CXX=clang++
+        fi
+
+        ./configure \
+            --prefix=${PREFIX} \
+            --build=x86_64-linux-gnu \
+            --host=${target_host} \
+            --disable-rpath \
+            && make -j${NPROC} && make install && make clean \
     )
 
 done
diff --git a/etc/scripts/build-external-libs/iconv/fetch.sh b/etc/scripts/build-external-libs/iconv/fetch.sh
index df22c3c..1ed1bc8 100755
--- a/etc/scripts/build-external-libs/iconv/fetch.sh
+++ b/etc/scripts/build-external-libs/iconv/fetch.sh
@@ -35,15 +35,21 @@ source etc/scripts/build-external-libs/env.sh
 
 cd $BUILD_ROOT_SRC
 
+name=libiconv
 version=1.16
 hash=e6a1b1b589654277ee790cce3734f07876ac4ccfaecbee8afa0b649cf529cc04
-name=libiconv
+url=http://ftp.gnu.org/pub/gnu/${name}/${name}-${version}.tar.gz
+out=${name}-${version}.tar.gz
 
 rm -rf ${name}-${version}
-curl -# -L -O \
-     http://ftp.gnu.org/pub/gnu/${name}/${name}-${version}.tar.gz
 
-echo "${hash} ${name}-${version}.tar.gz" | sha256sum -c
+if [ -f $SRC_ICONV ]; then
+    echo "using pre-fetched $name"
+    cp $SRC_ICONV  $out
+else
+    curl -# -L -o $out -O $url
+fi
 
-tar -xzf ${name}-${version}.tar.gz
+echo "$hash $out" | sha256sum -c
+tar -xzf $out
 
diff --git a/etc/scripts/build-external-libs/openssl/build.sh b/etc/scripts/build-external-libs/openssl/build.sh
index e27e0ae..5907d48 100755
--- a/etc/scripts/build-external-libs/openssl/build.sh
+++ b/etc/scripts/build-external-libs/openssl/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
@@ -64,18 +64,30 @@ for arch in ${archs[@]}; do
 
     echo "building for ${arch}"
 
+
     (
-        export CC=clang
-        export CXX=clang++
-        export ANDROID_API=23
-        export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
+        ANDROID_API=29
         export ANDROID_NDK_HOME=$ANDROID_NDK_ROOT
 
+        PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
+        if [ -x "$(command -v ccache)" ]; then
+            echo "////////////////////////////////////////////"
+            echo "//              CCACHE 1                  //"
+            echo "////////////////////////////////////////////"
+            CC="ccache clang"
+            CXX="ccache clang++"
+        else
+            CC=clang
+            CXX=clang++
+        fi
+
         ./Configure android-${arch} \
                     --prefix=${PREFIX} \
                     no-comp \
                     -D__ANDROID_API__=$ANDROID_API \
-            && make -j${NPROC} && make install && make clean \
+            && make -j${NPROC} SHLIB_VERSION_NUMBER= SHLIB_EXT=.so \
+            && make install_sw SHLIB_VERSION_NUMBER= SHLIB_EXT=.so \
+            && make clean \
     )
 
 done
diff --git a/etc/scripts/build-external-libs/openssl/fetch.sh b/etc/scripts/build-external-libs/openssl/fetch.sh
index 21d6e7e..bae8fb1 100755
--- a/etc/scripts/build-external-libs/openssl/fetch.sh
+++ b/etc/scripts/build-external-libs/openssl/fetch.sh
@@ -38,12 +38,18 @@ cd $BUILD_ROOT_SRC
 name=openssl
 version=1.1.1g
 hash=ddb04774f1e32f0c49751e21b67216ac87852ceb056b75209af2443400636d46
+url=https://www.openssl.org/source/openssl-${version}.tar.gz
+out=openssl-${version}.tar.gz
 
 rm -rf ${name}-${version}
 
-curl -# -L -O \
-     https://www.openssl.org/source/openssl-${version}.tar.gz
+if [ -f $SRC_OPENSSL ]; then
+    echo "using pre-fetched $name"
+    cp $SRC_OPENSSL $out
+else
+    curl -# -L -o $out -O $url
+fi
 
-echo "${hash} ${name}-${version}.tar.gz" | sha256sum -c
+echo "${hash} $out" | sha256sum -c
 
-tar xzf ${name}-${version}.tar.gz
+tar xzf $out
diff --git a/etc/scripts/build-external-libs/sodium/build.sh b/etc/scripts/build-external-libs/sodium/build.sh
index 44dbd29..e1c2a88 100755
--- a/etc/scripts/build-external-libs/sodium/build.sh
+++ b/etc/scripts/build-external-libs/sodium/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
@@ -63,16 +63,24 @@ for arch in ${archs[@]}; do
     echo "building for ${arch}"
 
     (
-        PATH=$build_root/tool/$arch/$target_host/bin:$build_root/tool/$arch/bin:$PATH \
-            CC=clang \
-            CXX=clang++; \
+        PATH=$build_root/tool/$arch/$target_host/bin:$build_root/tool/$arch/bin:$PATH
+        if [ -x "$(command -v ccache)" ]; then
+            echo "////////////////////////////////////////////"
+            echo "//              CCACHE 1                  //"
+            echo "////////////////////////////////////////////"
+            CC="ccache clang"
+            CXX="ccache clang++"
+        else
+            CC=clang
+            CXX=clang++
+        fi
 
-            ./configure \
-            --prefix=${PREFIX} \
-            --host=${target_host} \
-            --enable-static \
-            --disable-shared \
-            && make -j${NPROC} && make install && make clean \
+        ./configure \
+        --prefix=${PREFIX} \
+        --host=${target_host} \
+        --enable-static \
+        --disable-shared \
+        && make -j${NPROC} && make install && make clean \
     )
 
 done
diff --git a/etc/scripts/build-external-libs/sodium/fetch.sh b/etc/scripts/build-external-libs/sodium/fetch.sh
index c9a7928..10bcfff 100755
--- a/etc/scripts/build-external-libs/sodium/fetch.sh
+++ b/etc/scripts/build-external-libs/sodium/fetch.sh
@@ -38,12 +38,18 @@ cd $BUILD_ROOT_SRC
 name=libsodium
 version=1.0.18
 hash=d59323c6b712a1519a5daf710b68f5e7fde57040845ffec53850911f10a5d4f4
+url=https://github.com/jedisct1/libsodium/archive/${version}.tar.gz
+out=${name}-${version}.tar.gz
 
 rm -rf ${name}-${version}
 
-curl -# -L -o ${name}-${version}.tar.gz \
-https://github.com/jedisct1/libsodium/archive/${version}.tar.gz
+if [ -f $SRC_SODIUM ]; then
+    echo "using pre-fetched $name"
+    cp $SRC_SODIUM  $out
+else
+    curl -# -L -o $out -O $url
+fi
 
-echo "${hash} ${name}-${version}.tar.gz" | sha256sum -c
+echo "${hash} $out" | sha256sum -c
 
-tar xzf ${name}-${version}.tar.gz
+tar xzf $out
diff --git a/etc/scripts/build-external-libs/toolchain/import.sh b/etc/scripts/build-external-libs/toolchain/import.sh
index 597a299..76634aa 100755
--- a/etc/scripts/build-external-libs/toolchain/import.sh
+++ b/etc/scripts/build-external-libs/toolchain/import.sh
@@ -36,7 +36,7 @@ source etc/scripts/build-external-libs/env.sh
 build_root=$BUILD_ROOT
 PATH=$ANDROID_NDK_ROOT/build/tools/:$PATH
 
-args="--api 23 --stl=libc++"
+args="--api 29 --stl=libc++"
 archs=(arm64)
 
 for arch in ${archs[@]}; do
diff --git a/etc/scripts/build-external-libs/wownero/build.sh b/etc/scripts/build-external-libs/wownero/build.sh
index d057b43..86226f3 100755
--- a/etc/scripts/build-external-libs/wownero/build.sh
+++ b/etc/scripts/build-external-libs/wownero/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (c) 2019, The Wownero Project
 # Copyright (c) 2014-2019, The Monero Project
@@ -77,10 +77,10 @@ for arch in ${archs[@]}; do
     cd build/release
     (
         CMAKE_INCLUDE_PATH="${PREFIX}/include" \
-          CMAKE_LIBRARY_PATH="${PREFIX}/lib" \
-          CC=aarch64-linux-android-clang \
-          CXX=aarch64-linux-android-clang++ \
-          cmake \
+        CMAKE_LIBRARY_PATH="${PREFIX}/lib" \
+        CC=aarch64-linux-android-clang \
+        CXX=aarch64-linux-android-clang++ \
+        cmake \
           -D BUILD_TESTS=OFF \
           -D ARCH="armv8-a" \
           -D STATIC=ON \
diff --git a/etc/scripts/build-external-libs/wownero/fetch.sh b/etc/scripts/build-external-libs/wownero/fetch.sh
index 3c456f0..cba3f01 100755
--- a/etc/scripts/build-external-libs/wownero/fetch.sh
+++ b/etc/scripts/build-external-libs/wownero/fetch.sh
@@ -39,14 +39,40 @@ name=wownero
 # version=v0.7.0
 version=dev-v0.8
 githash=4c6c7ab87b2a56165f400f6e49f17b9577a2bcad
+out=wownero
 
-rm -rf $name
+chmod u+w -f -R $out || true
 
-git clone --depth 1 https://github.com/fuwa0529/wownero.git -b $version
+rm -rf $out
+
+if [ -d $SRC_WOWNERO_DIR ]; then
+    echo "using pre-fetched $name"
+    rsync -av --no-perms --no-owner --no-group --delete $SRC_WOWNERO_DIR/* $out
+    chmod u+w -R $out/external
+else
+    git clone --depth 1 https://github.com/wownero/wownero.git -b $version
+    # test `git rev-parse HEAD` = $githash || exit 1
+fi
 
 cd $name
-# test `git rev-parse HEAD` = $githash || exit 1
 
-git submodule update --init external/miniupnp
-git submodule update --init external/rapidjson
-git submodule update --init external/RandomWOW
+if [ -d $SRC_MINIUPNP_DIR ]; then
+    echo "using pre-fetched miniupnpc"
+    rsync -av --no-perms --no-owner --no-group --delete $SRC_MINIUPNP_DIR/* external/miniupnp
+else
+    git submodule update --init external/miniupnp
+fi
+
+if [ -d $SRC_RAPIDJSON_DIR ]; then
+    echo "using pre-fetched rapidjson"
+    rsync -av --no-perms --no-owner --no-group --delete $SRC_RAPIDJSON_DIR/* external/rapidjson
+else
+    git submodule update --init external/rapidjson
+fi
+
+if [ -f $SRC_RANDOMWOW ]; then
+    echo "using pre-fetched RandomWOW"
+    tar xzf $SRC_RANDOMWOW -C external/RandomWOW --strip-components=1
+else
+    git submodule update --init external/RandomWOW
+fi
diff --git a/etc/scripts/docker-build-wownero.sh b/etc/scripts/docker-build-wownero.sh
deleted file mode 100755
index aa15f6e..0000000
--- a/etc/scripts/docker-build-wownero.sh
+++ /dev/null
@@ -1,49 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright (c) 2019, The Wownero Project
-# Copyright (c) 2014-2019, The Monero Project
-#
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without modification, are
-# permitted provided that the following conditions are met:
-#
-# 1. Redistributions of source code must retain the above copyright notice, this list of
-#    conditions and the following disclaimer.
-#
-# 2. Redistributions in binary form must reproduce the above copyright notice, this list
-#    of conditions and the following disclaimer in the documentation and/or other
-#    materials provided with the distribution.
-#
-# 3. Neither the name of the copyright holder nor the names of its contributors may be
-#    used to endorse or promote products derived from this software without specific
-#    prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
-# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
-# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
-# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-set -e
-
-version="aba46a"
-container="wownero-android-${version}"
-
-echo "Building: ${container}"
-echo
-
-cd ../vendor/wownero
-git fetch --all
-
-git checkout $version
-git submodule init && git submodule update
-
-docker build -f utils/build_scripts/android64.Dockerfile -t $container .
-docker create -it --name $container $container bash
-docker cp ${container}:/src/build/release/bin .
-