diff --git a/.github/workflows/avr-gcc-build-msys2-gcc.yml b/.github/workflows/avr-gcc-build-msys2-gcc.yml
new file mode 100644
index 0000000..2ab192a
--- /dev/null
+++ b/.github/workflows/avr-gcc-build-msys2-gcc.yml
@@ -0,0 +1,47 @@
+##############################################################################
+#  Copyright Christopher Kormanyos 2023.
+#  Distributed under The Unlicense.
+
+name: avr-gcc-build-msys2-gcc
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+jobs:
+  avr-gcc-build-msys2:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    strategy:
+      fail-fast: false
+      matrix:
+        gccversion: [ 12.3.0 ]
+    steps:
+      - uses: actions/checkout@v3
+      - name: unpack-repo-nuwen-mingw-subset
+        shell: cmd
+        run: |
+          start /b /wait ./mingw.exe -y -gm2 -InstallPath="D:\\a\\avr-gcc-build\\avr-gcc-build\\mingw"
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: mingw64
+          update: true
+          install: autoconf automake bzip2 cmake git make ninja patch python texinfo wget
+      - name: avr-gcc-100-12.3.0_x86_64-w64-mingw32
+        shell: msys2 {0}
+        run: |
+          echo 'avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh'
+          ./avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh
+      - name: avr-gcc-partially-verify-result
+        shell: msys2 {0}
+        run: |
+          echo 'avr-gcc partial verify result'
+          ls -la /d/a/avr-gcc-build/avr-gcc-build/local/gcc-12.3.0-avr/bin
+          ls -la /d/a/avr-gcc-build/avr-gcc-build/local/gcc-12.3.0-avr/bin/avr-gcc.exe
+          ls -la /d/a/avr-gcc-build/avr-gcc-build/local/gcc-12.3.0-avr/bin/avr-g++.exe
+      - uses: actions/upload-artifact@v4
+        with:
+          name: gcc-12.3.0-avr
+          path: d:/a/avr-gcc-build/avr-gcc-build/local/gcc-12.3.0-avr
diff --git a/.github/workflows/avr-gcc-build.yml b/.github/workflows/avr-gcc-build.yml
index 7a040cc..0166838 100644
--- a/.github/workflows/avr-gcc-build.yml
+++ b/.github/workflows/avr-gcc-build.yml
@@ -79,4 +79,9 @@ jobs:
           cd ${{ runner.workspace }}/avr-gcc-build/real-time-cpp/ref_app
           PATH=${{ runner.workspace }}/avr-gcc-build/local/gcc-${{ matrix.branchname }}-avr/bin:"$PATH"
           ./target/build/build.sh avr rebuild
-          ls -la bin/ref_app.elf bin/ref_app.hex bin/ref_app.map bin/ref_app.s19 bin/ref_app_cppfilt.txt bin/ref_app_nm.txt bin/ref_app_readelf.txt bin/ref_app_size.txt
+          ls -la bin/ref_app.elf bin/ref_app.hex
+          ls -la bin/ref_app.map bin/ref_app.s19
+          ls -la bin/ref_app_cppfilt.txt
+          ls -la bin/ref_app_nm.txt
+          ls -la bin/ref_app_readelf.txt
+          ls -la bin/ref_app_size.txt
diff --git a/README.md b/README.md
index c69f176..4b6d18d 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,10 @@ directly from the Workflow-Run(s) on GHA.
 
 Design goals:
   - Use shell and YAML scripts to build modern `avr-gcc` on-the-fly.
-  - Build `avr-gcc` from up-to-date branches such as `trunk` and `releases/gcc-13` found in [`gcc-mirror/gcc`](https://github.com/gcc-mirror/gcc).
+  - Build `avr-gcc` from up-to-date releases such as 12.3.0 or modern branches like `trunk` and `releases/gcc-13` found in [`gcc-mirror/gcc`](https://github.com/gcc-mirror/gcc).
   - Provide a non-trivial test of the newly-built toolchain(s) based on a real-world project.
   - Support cyclic monthly build of modern, evolving GCC branch(es) and trunk.
   - Publish the build artifacts directly from the Workflow-Run(s) on GHA.
-  - Provide a [shell script recipe](./avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh) for local build of `avr-gcc` on `x86_64-w64-mingw32` host. This does not run on GHA at the moment, but can be executed locally.
 
 ## Workflow-Run
 
@@ -41,10 +40,9 @@ is used for archiving build artifacts.
 
 ## Additional Details
 
-This project is distributed under [The Unlicense](./UNLICENSE).
-
-Limitations:
-  - At the moment, the Workflow-Run builds `avr-gcc` for the _host_ `x86_64-linux-gnu` only. Cross-host compilation for `x86_64-w64-mingw32` does not work.
-  - A [shell script recipe](./avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh) for local build of `avr-gcc` on `x86_64-w64-mingw32` host. It does not run on GHA at the moment, but can be executed locally.
+Details:
+  - This project is distributed under [The Unlicense](./UNLICENSE).
+  - The Workflow-Run [avr-gcc-build.yml](./.github/workflows/avr-gcc-build.yml) and associated shell scripts (`avr-gcc-010*.sh`, `avr-gcc-020*.sh`, and `avr-gcc-030*.sh`) build `avr-gcc` for the _host_ `x86_64-linux-gnu`. These run on GHA using `ubuntu-latest` runners.
+  - The Workflow-Run [avr-gcc-build-msys2-gcc.yml](./.github/workflows/avr-gcc-build-msys2-gcc.yml) and shell script [avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh](./avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh) build `avr-gcc` for the _host_ `x86_64-w64-mingw32`. These run on GHA within `msys2` using `windows-latest` runners.
 
 This work has been inspired by a similar project: [`ZakKemble/avr-gcc-build`](https://github.com/ZakKemble/avr-gcc-build).
diff --git a/_reference_avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh b/_reference_avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh
new file mode 100644
index 0000000..b3b49bc
--- /dev/null
+++ b/_reference_avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh
@@ -0,0 +1,203 @@
+#!/usr/bin/env bash
+#
+#  Copyright Christopher Kormanyos 2023.
+#  Distributed under The Unlicense.
+#
+
+SCRIPT_PATH=$(readlink -f "$BASH_SOURCE")
+SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
+
+
+# echo 'install necessary packages and build tools'
+# pacman -S --needed --noconfirm wget git make cmake ninja patch texinfo bzip2 xz autoconf automake python
+
+# Get standalone msys2 from nuwen (contains standalone gcc-x86_64-w64-mingw32).
+# The page describing this is: https://nuwen.net/mingw.html
+# The exact download link is: https://nuwen.net/files/mingw/mingw-18.0.exe
+
+# For detailed background information, see also the detailed instructions
+# at GitHub from Stephan T. Lavavej's repositiony.
+# These can be found here: https://github.com/StephanTLavavej/mingw-distro
+
+
+echo 'clean gcc_build directory'
+rm -rf gcc_build | true
+
+
+echo 'make and enter gcc_build directory'
+mkdir -p $SCRIPT_DIR/gcc_build
+echo
+
+
+echo 'copy gcc 12.3.0 patch file'
+cd $SCRIPT_DIR/gcc_build
+cp ../avr-gcc-100-12.3.0_x86_64-w64-mingw32.patch .
+echo
+
+
+echo 'append standalone gcc-x86_64-w64-mingw32 path'
+export X_DISTRO_ROOT=/c/mingw
+export X_DISTRO_BIN=$X_DISTRO_ROOT/bin
+export X_DISTRO_INC=$X_DISTRO_ROOT/include
+export X_DISTRO_LIB=$X_DISTRO_ROOT/lib
+export PATH=$PATH:$X_DISTRO_BIN
+export C_INCLUDE_PATH=$X_DISTRO_INC
+export CPLUS_INCLUDE_PATH=$X_DISTRO_INC
+echo
+
+
+echo 'query version pre-installed standalone gcc-x86_64-w64-mingw32'
+g++ -v
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'get tar-balls'
+wget --no-check-certificate https://github.com/facebook/zstd/releases/download/v1.5.5/zstd-1.5.5.tar.gz
+wget --no-check-certificate https://ftp.gnu.org/gnu/libiconv/libiconv-1.17.tar.gz
+wget --no-check-certificate https://ftp.gnu.org/gnu/gmp/gmp-6.3.0.tar.xz
+wget --no-check-certificate https://ftp.gnu.org/gnu/mpfr/mpfr-4.2.1.tar.xz
+wget --no-check-certificate https://ftp.gnu.org/gnu/mpc/mpc-1.3.1.tar.gz
+wget --no-check-certificate https://gcc.gnu.org/pub/gcc/infrastructure/isl-0.15.tar.bz2
+wget --no-check-certificate https://gcc.gnu.org/pub/gcc/infrastructure/cloog-0.18.1.tar.gz
+wget --no-check-certificate https://ftp.gnu.org/gnu/binutils/binutils-2.41.tar.xz
+wget --no-check-certificate https://ftp.gnu.org/gnu/gcc/gcc-12.3.0/gcc-12.3.0.tar.xz
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build zstd'
+tar -xf zstd-1.5.5.tar.gz
+mkdir objdir-zstd-1.5.5
+cd objdir-zstd-1.5.5
+cmake "-DCMAKE_BUILD_TYPE=Release" "-DCMAKE_C_FLAGS=-s -O3" "-DCMAKE_INSTALL_PREFIX=/usr/local/zstd-1.5.5" "-DZSTD_BUILD_SHARED=OFF" -G Ninja $SCRIPT_DIR/gcc_build/zstd-1.5.5/build/cmake
+ninja
+ninja install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build libiconv'
+tar -xf libiconv-1.17.tar.gz
+mkdir objdir-libiconv-1.17
+cd objdir-libiconv-1.17
+../libiconv-1.17/configure --prefix=/usr/local/libiconv-1.17 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build gmp'
+tar -xf gmp-6.3.0.tar.xz
+mkdir objdir-gmp-6.3.0
+cd objdir-gmp-6.3.0
+../gmp-6.3.0/configure --prefix=/usr/local/gmp-6.3.0 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build mpfr'
+tar -xf mpfr-4.2.1.tar.xz
+mkdir objdir-mpfr-4.2.1
+cd objdir-mpfr-4.2.1
+../mpfr-4.2.1/configure --prefix=/usr/local/mpfr-4.2.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=/usr/local/gmp-6.3.0
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build mpc'
+tar -xf mpc-1.3.1.tar.gz
+mkdir objdir-mpc-1.3.1
+cd objdir-mpc-1.3.1
+../mpc-1.3.1/configure --prefix=/usr/local/mpc-1.3.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=/usr/local/gmp-6.3.0 --with-mpfr=/usr/local/mpfr-4.2.1
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build isl'
+tar -xjf isl-0.15.tar.bz2
+mkdir objdir-isl-0.15
+cd objdir-isl-0.15
+../isl-0.15/configure --prefix=/usr/local/isl-0.15 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp-prefix=/usr/local/gmp-6.3.0
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build cloog'
+tar -xf cloog-0.18.1.tar.gz
+mkdir objdir-cloog-0.18.1
+cd objdir-cloog-0.18.1
+../cloog-0.18.1/configure --prefix=/usr/local/cloog-0.18.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-isl=/usr/local/isl-0.15 --with-gmp=/usr/local/gmp-6.3.0
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build binutils'
+tar -xf binutils-2.41.tar.xz
+mkdir objdir-binutils-2.41-avr-gcc-12.3.0
+cd objdir-binutils-2.41-avr-gcc-12.3.0
+../binutils-2.41/configure --prefix=/usr/local/gcc-12.3.0-avr --target=avr --enable-languages=c,c++ --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --with-pkgversion='Built by ckormanyos/real-time-cpp' --enable-static --disable-shared --disable-libada --disable-libssp --disable-nls --enable-mingw-wildcard --with-gnu-as --with-dwarf2 --with-isl=/usr/local/isl-0.15 --with-cloog=/usr/local/cloog-0.18.1 --with-gmp=/usr/local/gmp-6.3.0 --with-mpfr=/usr/local/mpfr-4.2.1 --with-mpc=/usr/local/mpc-1.3.1 --with-libiconv-prefix=/usr/local/libiconv-1.17 --with-zstd=/usr/local/zstd-1.5.5/lib --disable-werror
+make --jobs=6
+make install
+echo
+
+
+#
+# Notes on patch of GCC-12.3.0
+#
+
+# How do you make the patch?
+#   diff -ru gcc-12.3.0/ gcc-12.3.0_new/ > avr-gcc-100-12.3.0_x86_64-w64-mingw32.patch
+
+# How do you apply the patch?
+#   patch -p0 < avr-gcc-100-12.3.0_x86_64-w64-mingw32.patch
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build gcc'
+tar -xf gcc-12.3.0.tar.xz
+patch -p0 < avr-gcc-100-12.3.0_x86_64-w64-mingw32.patch
+mkdir objdir-gcc-12.3.0-avr
+cd objdir-gcc-12.3.0-avr
+../gcc-12.3.0/configure --prefix=/usr/local/gcc-12.3.0-avr --target=avr --enable-languages=c,c++ --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --with-pkgversion='Built by ckormanyos/real-time-cpp' --enable-static --disable-shared --disable-libada --disable-libssp --disable-nls --enable-mingw-wildcard --with-gnu-as --with-dwarf2 --with-isl=/usr/local/isl-0.15 --with-cloog=/usr/local/cloog-0.18.1 --with-gmp=/usr/local/gmp-6.3.0 --with-mpfr=/usr/local/mpfr-4.2.1 --with-mpc=/usr/local/mpc-1.3.1 --with-libiconv-prefix=/usr/local/libiconv-1.17 --with-zstd=/usr/local/zstd-1.5.5/lib
+make --jobs=6
+make install
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'clone and bootstrap avr-libc'
+git clone -b main --depth 1 https://github.com/avrdudes/avr-libc.git ./avr-libc
+rm -f avr-libc/tests/simulate/time/aux.c
+cd avr-libc
+./bootstrap
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'add avr-gcc path'
+PATH=/usr/local/gcc-12.3.0-avr/bin:"$PATH"
+export PATH
+CC=""
+export CC
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build avr-libc'
+cd objdir-gcc-12.3.0-avr
+../avr-libc/configure --prefix=/usr/local/gcc-12.3.0-avr --build=x86_64-w64-mingw32 --host=avr --enable-static --disable-shared
+make --jobs=6
+make install
+echo
diff --git a/avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh b/avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh
index f43754c..bbb2bc2 100755
--- a/avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh
+++ b/avr-gcc-100-12.3.0_x86_64-w64-mingw32.sh
@@ -9,7 +9,15 @@ SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
 
 
 # echo 'install necessary packages and build tools'
-# pacman -S --needed --noconfirm wget make patch git mingw-w64-ucrt-x86_64-gcc texinfo bzip2 xz autoconf automake python unzip
+# pacman -S --needed --noconfirm wget git make cmake ninja patch texinfo bzip2 xz autoconf automake python
+
+# Get standalone msys2 from nuwen (contains standalone gcc-x86_64-w64-mingw32).
+# The page describing this is: https://nuwen.net/mingw.html
+# The exact download link is: https://nuwen.net/files/mingw/mingw-18.0.exe
+
+# For detailed background information, see also the detailed instructions
+# at GitHub from Stephan T. Lavavej's repositiony.
+# These can be found here: https://github.com/StephanTLavavej/mingw-distro
 
 
 echo 'clean gcc_build directory'
@@ -17,15 +25,35 @@ rm -rf gcc_build | true
 
 
 echo 'make and enter gcc_build directory'
-mkdir $SCRIPT_DIR/gcc_build
+mkdir -p $SCRIPT_DIR/gcc_build
+echo
 
 
+echo 'copy gcc 12.3.0 patch file'
 cd $SCRIPT_DIR/gcc_build
 cp ../avr-gcc-100-12.3.0_x86_64-w64-mingw32.patch .
+echo
+
+
+echo 'append standalone gcc-x86_64-w64-mingw32 path'
+export X_DISTRO_ROOT=$SCRIPT_DIR/mingw
+export X_DISTRO_BIN=$X_DISTRO_ROOT/bin
+export X_DISTRO_INC=$X_DISTRO_ROOT/include
+export X_DISTRO_LIB=$X_DISTRO_ROOT/lib
+export PATH=$PATH:$X_DISTRO_BIN
+export C_INCLUDE_PATH=$X_DISTRO_INC
+export CPLUS_INCLUDE_PATH=$X_DISTRO_INC
+echo
+
+
+echo 'query version pre-installed standalone gcc-x86_64-w64-mingw32'
+g++ -v
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
 echo 'get tar-balls'
+wget --no-check-certificate https://github.com/facebook/zstd/releases/download/v1.5.5/zstd-1.5.5.tar.gz
 wget --no-check-certificate https://ftp.gnu.org/gnu/libiconv/libiconv-1.17.tar.gz
 wget --no-check-certificate https://ftp.gnu.org/gnu/gmp/gmp-6.3.0.tar.xz
 wget --no-check-certificate https://ftp.gnu.org/gnu/mpfr/mpfr-4.2.1.tar.xz
@@ -34,6 +62,18 @@ wget --no-check-certificate https://gcc.gnu.org/pub/gcc/infrastructure/isl-0.15.
 wget --no-check-certificate https://gcc.gnu.org/pub/gcc/infrastructure/cloog-0.18.1.tar.gz
 wget --no-check-certificate https://ftp.gnu.org/gnu/binutils/binutils-2.41.tar.xz
 wget --no-check-certificate https://ftp.gnu.org/gnu/gcc/gcc-12.3.0/gcc-12.3.0.tar.xz
+echo
+
+
+cd $SCRIPT_DIR/gcc_build
+echo 'build zstd'
+tar -xf zstd-1.5.5.tar.gz
+mkdir objdir-zstd-1.5.5
+cd objdir-zstd-1.5.5
+cmake "-DCMAKE_BUILD_TYPE=Release" "-DCMAKE_C_FLAGS=-s -O3" "-DCMAKE_INSTALL_PREFIX=$SCRIPT_DIR/local/zstd-1.5.5" "-DZSTD_BUILD_SHARED=OFF" -G Ninja $SCRIPT_DIR/gcc_build/zstd-1.5.5/build/cmake
+ninja
+ninja install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -41,9 +81,10 @@ echo 'build libiconv'
 tar -xf libiconv-1.17.tar.gz
 mkdir objdir-libiconv-1.17
 cd objdir-libiconv-1.17
-../libiconv-1.17/configure --prefix=/usr/local/libiconv-1.17 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
-make --job=6
+../libiconv-1.17/configure --prefix=$SCRIPT_DIR/local/libiconv-1.17 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
+make --jobs=6
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -51,9 +92,10 @@ echo 'build gmp'
 tar -xf gmp-6.3.0.tar.xz
 mkdir objdir-gmp-6.3.0
 cd objdir-gmp-6.3.0
-../gmp-6.3.0/configure --prefix=/usr/local/gmp-6.3.0 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
+../gmp-6.3.0/configure --prefix=$SCRIPT_DIR/local/gmp-6.3.0 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared
 make --jobs=6
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -61,9 +103,10 @@ echo 'build mpfr'
 tar -xf mpfr-4.2.1.tar.xz
 mkdir objdir-mpfr-4.2.1
 cd objdir-mpfr-4.2.1
-../mpfr-4.2.1/configure --prefix=/usr/local/mpfr-4.2.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=/usr/local/gmp-6.3.0
+../mpfr-4.2.1/configure --prefix=$SCRIPT_DIR/local/mpfr-4.2.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=$SCRIPT_DIR/local/gmp-6.3.0
 make --jobs=6
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -71,9 +114,10 @@ echo 'build mpc'
 tar -xf mpc-1.3.1.tar.gz
 mkdir objdir-mpc-1.3.1
 cd objdir-mpc-1.3.1
-../mpc-1.3.1/configure --prefix=/usr/local/mpc-1.3.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=/usr/local/gmp-6.3.0 --with-mpfr=/usr/local/mpfr-4.2.1
+../mpc-1.3.1/configure --prefix=$SCRIPT_DIR/local/mpc-1.3.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=$SCRIPT_DIR/local/gmp-6.3.0 --with-mpfr=$SCRIPT_DIR/local/mpfr-4.2.1
 make --jobs=6
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -81,9 +125,10 @@ echo 'build isl'
 tar -xjf isl-0.15.tar.bz2
 mkdir objdir-isl-0.15
 cd objdir-isl-0.15
-../isl-0.15/configure --prefix=/usr/local/isl-0.15 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp=/usr/local/gmp-6.3.0
+../isl-0.15/configure --prefix=$SCRIPT_DIR/local/isl-0.15 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-gmp-prefix=$SCRIPT_DIR/local/gmp-6.3.0
 make --jobs=6
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -91,9 +136,10 @@ echo 'build cloog'
 tar -xf cloog-0.18.1.tar.gz
 mkdir objdir-cloog-0.18.1
 cd objdir-cloog-0.18.1
-../cloog-0.18.1/configure --prefix=/usr/local/cloog-0.18.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-isl=/usr/local/isl-0.15 --with-gmp=/usr/local/gmp-6.3.0
+../cloog-0.18.1/configure --prefix=$SCRIPT_DIR/local/cloog-0.18.1 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --enable-static --disable-shared --with-isl=$SCRIPT_DIR/local/isl-0.15 --with-gmp-prefix=$SCRIPT_DIR/local/gmp-6.3.0
 make --jobs=6
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -101,9 +147,19 @@ echo 'build binutils'
 tar -xf binutils-2.41.tar.xz
 mkdir objdir-binutils-2.41-avr-gcc-12.3.0
 cd objdir-binutils-2.41-avr-gcc-12.3.0
-../binutils-2.41/configure --prefix=/usr/local/gcc-12.3.0-avr --target=avr --enable-languages=c,c++ --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --with-pkgversion='Built by ckormanyos/real-time-cpp' --enable-static --disable-shared --disable-libada --disable-libssp --disable-nls --enable-mingw-wildcard --with-gnu-as --with-dwarf2 --with-isl=/usr/local/isl-0.15 --with-cloog=/usr/local/cloog-0.18.1 --with-gmp=/usr/local/gmp-6.3.0 --with-mpfr=/usr/local/mpfr-4.2.1 --with-mpc=/usr/local/mpc-1.3.1 --with-libiconv-prefix=/usr/local/libiconv-1.17 --disable-werror
-make --jobs=6
+../binutils-2.41/configure --prefix=$SCRIPT_DIR/local/gcc-12.3.0-avr --target=avr --enable-languages=c,c++ --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --with-pkgversion='Built by ckormanyos/real-time-cpp' --enable-static --disable-shared --disable-libada --disable-libssp --disable-nls --enable-mingw-wildcard --with-gnu-as --with-dwarf2 --with-isl=$SCRIPT_DIR/local/isl-0.15 --with-cloog=$SCRIPT_DIR/local/cloog-0.18.1 --with-gmp=$SCRIPT_DIR/local/gmp-6.3.0 --with-mpfr=$SCRIPT_DIR/local/mpfr-4.2.1 --with-mpc=$SCRIPT_DIR/local/mpc-1.3.1 --with-libiconv-prefix=$SCRIPT_DIR/local/libiconv-1.17 --with-zstd=$SCRIPT_DIR/local/zstd-1.5.5/lib --disable-werror
+make --jobs=8
 make install
+echo
+
+
+ls -la $SCRIPT_DIR/local/gcc-12.3.0-avr/bin
+ls -la $SCRIPT_DIR/local/gcc-12.3.0-avr/bin/avr-ld.exe
+result_binutils=$?
+
+
+echo "result_binutils: " "result_binutils"
+echo
 
 
 #
@@ -123,9 +179,10 @@ tar -xf gcc-12.3.0.tar.xz
 patch -p0 < avr-gcc-100-12.3.0_x86_64-w64-mingw32.patch
 mkdir objdir-gcc-12.3.0-avr
 cd objdir-gcc-12.3.0-avr
-../gcc-12.3.0/configure --prefix=/usr/local/gcc-12.3.0-avr --target=avr --enable-languages=c,c++ --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --with-pkgversion='Built by ckormanyos/real-time-cpp' --enable-static --disable-shared --disable-libada --disable-libssp --disable-nls --enable-mingw-wildcard --with-gnu-as --with-dwarf2 --with-isl=/usr/local/isl-0.15 --with-cloog=/usr/local/cloog-0.18.1 --with-gmp=/usr/local/gmp-6.3.0 --with-mpfr=/usr/local/mpfr-4.2.1 --with-mpc=/usr/local/mpc-1.3.1 --with-libiconv-prefix=/usr/local/libiconv-1.17
-make --jobs=6
+../gcc-12.3.0/configure --prefix=$SCRIPT_DIR/local/gcc-12.3.0-avr --target=avr --enable-languages=c,c++ --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --with-pkgversion='Built by ckormanyos/real-time-cpp' --enable-static --disable-shared --disable-libada --disable-libssp --disable-nls --enable-mingw-wildcard --with-gnu-as --with-dwarf2 --with-isl=$SCRIPT_DIR/local/isl-0.15 --with-cloog=$SCRIPT_DIR/local/cloog-0.18.1 --with-gmp=$SCRIPT_DIR/local/gmp-6.3.0 --with-mpfr=$SCRIPT_DIR/local/mpfr-4.2.1 --with-mpc=$SCRIPT_DIR/local/mpc-1.3.1 --with-libiconv-prefix=$SCRIPT_DIR/local/libiconv-1.17 --with-zstd=$SCRIPT_DIR/local/zstd-1.5.5/lib
+make --jobs=8
 make install
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
@@ -134,19 +191,41 @@ git clone -b main --depth 1 https://github.com/avrdudes/avr-libc.git ./avr-libc
 rm -f avr-libc/tests/simulate/time/aux.c
 cd avr-libc
 ./bootstrap
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
 echo 'add avr-gcc path'
-PATH=/usr/local/gcc-12.3.0-avr/bin:"$PATH"
+PATH=$SCRIPT_DIR/local/gcc-12.3.0-avr/bin:"$PATH"
 export PATH
 CC=""
 export CC
+echo
 
 
 cd $SCRIPT_DIR/gcc_build
 echo 'build avr-libc'
 cd objdir-gcc-12.3.0-avr
-../avr-libc/configure --prefix=/usr/local/gcc-12.3.0-avr --build=x86_64-w64-mingw32 --host=avr --enable-static --disable-shared
-make --jobs=6
+../avr-libc/configure --prefix=$SCRIPT_DIR/local/gcc-12.3.0-avr --build=x86_64-w64-mingw32 --host=avr --enable-static --disable-shared
+make --jobs=8
 make install
+echo
+
+
+ls -la $SCRIPT_DIR/local/gcc-12.3.0-avr/bin
+ls -la $SCRIPT_DIR/local/gcc-12.3.0-avr/bin/avr-g++.exe
+result_gcc=$?
+
+
+echo "result_gcc: " "result_gcc"
+echo
+
+
+result_total=$((result_binutils+result_gcc))
+
+
+echo "result_total: " "$result_total"
+echo
+
+
+exit $result_total
diff --git a/mingw.exe b/mingw.exe
new file mode 100644
index 0000000..8693aa1
Binary files /dev/null and b/mingw.exe differ