diff --git a/.github/workflows/linux_build.yml b/.github/workflows/linux_build.yml
index 45c75f44..88562d67 100644
--- a/.github/workflows/linux_build.yml
+++ b/.github/workflows/linux_build.yml
@@ -7,24 +7,52 @@ jobs:
     runs-on: ubuntu-16.04
     strategy:
       matrix:
-        compiler: [ clang ]
+        compiler: [ gcc, clang ]
         include:
+          - compiler: gcc
+            cc: gcc
+            cxx: g++
           - compiler: clang
             cc: clang
             cxx: clang++
     steps:
       - uses: actions/checkout@v2
       - name: Install Dependencies
-        run: bash ./ci-scripts/linux/tahoma-install.sh
+        run: |
+          ci-scripts/linux/tahoma-install.sh
+          sudo apt-get install ccache
+      - uses: actions/cache@v2
+        with:
+          path: |
+            /home/runner/.ccache
+            /home/runner/work/tahoma2d/taoma2d/thirdparty/openh264
+            /home/runner/work/tahoma2d/taoma2d/thirdparty/ffmpeg
+            /home/runner/work/tahoma2d/taoma2d/thirdparty/ffmpeg_shared
+            /home/runner/work/tahoma2d/taoma2d/thirdparty/opencv
+          key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.compiler }}-
+            ${{ runner.os }}-
       - name: Build ffmpeg
-        run: bash ./ci-scripts/linux/tahoma-buildffmpeg.sh
+        run: |
+          export CC="ccache ${{ matrix.cc }}"
+          export CXX="ccache ${{ matrix.cxx }}"
+          ci-scripts/linux/tahoma-buildffmpeg.sh
       - name: Build OpenCV
-        run: bash ./ci-scripts/linux/tahoma-buildopencv.sh
+        run: |
+          export CC="ccache ${{ matrix.cc }}"
+          export CXX="ccache ${{ matrix.cxx }}"
+          ci-scripts/linux/tahoma-buildopencv.sh
       - name: Build Tahoma2D
-        run: bash ./ci-scripts/linux/tahoma-build.sh
+        run: |
+          export CC="ccache ${{ matrix.cc }}"
+          export CXX="ccache ${{ matrix.cxx }}"
+          ci-scripts/linux/tahoma-build.sh
       - name: Create Package
-        run: bash ./ci-scripts/linux/tahoma-buildpkg.sh
+        run: |
+          ci-scripts/linux/tahoma-buildpkg.sh
+          mv toonz/build/Tahoma2D-linux.tar.gz toonz/build/Tahoma2D-linux-${{ matrix.compiler }}.tar.gz
       - uses: actions/upload-artifact@v1
         with:
-          name: Tahoma2D-linux.tar.gz
-          path: toonz/build/Tahoma2D-linux.tar.gz
+          name: Tahoma2D-linux-${{ matrix.compiler }}.tar.gz
+          path: toonz/build/Tahoma2D-linux-${{ matrix.compiler }}.tar.gz
diff --git a/.github/workflows/macOS_build.yml b/.github/workflows/macOS_build.yml
index a2760910..12fd4218 100644
--- a/.github/workflows/macOS_build.yml
+++ b/.github/workflows/macOS_build.yml
@@ -8,13 +8,32 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Install Dependencies
-        run: bash ./ci-scripts/osx/tahoma-install.sh
+        run: |
+          ci-scripts/osx/tahoma-install.sh
+          brew install ccache
+          mkdir /Users/runner/.ccache
+      - uses: actions/cache@v2
+        with:
+          path: |
+            /Users/runner/.ccache
+            /Users/runner/work/tahoma2d/taoma2d/thirdparty/aom
+            /Users/runner/work/tahoma2d/taoma2d/thirdparty/ffmpeg
+            /Users/runner/work/tahoma2d/taoma2d/thirdparty/ffmpeg_shared
+            /Users/runner/work/tahoma2d/taoma2d/thirdparty/opencv
+          key: ${{ runner.os }}-${{ github.sha }}
+          restore-keys: ${{ runner.os }}-
       - name: Build ffmpeg
-        run: bash ./ci-scripts/osx/tahoma-buildffmpeg.sh
+        run: |
+          export PATH="/usr/local/opt/ccache/libexec:$PATH"
+          ci-scripts/osx/tahoma-buildffmpeg.sh
       - name: Build OpenCV
-        run: bash ./ci-scripts/osx/tahoma-buildopencv.sh
+        run: |
+          export PATH="/usr/local/opt/ccache/libexec:$PATH"
+          ci-scripts/osx/tahoma-buildopencv.sh
       - name: Build Tahoma2D
-        run: bash ./ci-scripts/osx/tahoma-build.sh
+        run: |
+          export PATH="/usr/local/opt/ccache/libexec:$PATH"
+          ci-scripts/osx/tahoma-build.sh
       - name: Create Package
         run: bash ./ci-scripts/osx/tahoma-buildpkg.sh
       - uses: actions/upload-artifact@v1
diff --git a/ci-scripts/linux/tahoma-buildffmpeg.sh b/ci-scripts/linux/tahoma-buildffmpeg.sh
index b5bf8733..ba293bfe 100755
--- a/ci-scripts/linux/tahoma-buildffmpeg.sh
+++ b/ci-scripts/linux/tahoma-buildffmpeg.sh
@@ -16,14 +16,17 @@ cd ..
 
 echo ">>> Cloning ffmpeg"
 git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg
+cp -R ffmpeg ffmpeg_shared
 
-cd ffmpeg
+cd ffmpeg_shared
 echo "*" >| .gitignore
 
 echo ">>> Configuring to build ffmpeg (shared)"
 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
 
 ./configure  --prefix=/usr/local \
+      --cc="$CC" \
+      --cxx="$CXX" \
       --toolchain=hardened \
       --pkg-config-flags="--static" \
       --extra-cflags="-I/usr/local/include" \
@@ -64,10 +67,14 @@ sudo make install
 sudo ldconfig
 
 echo ">>> Configuring to build ffmpeg (static)"
+cd ../ffmpeg
+echo "*" >| .gitignore
 
 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
 
 ./configure  --prefix=/usr/local \
+      --cc="$CC" \
+      --cxx="$CXX" \
       --pkg-config-flags="--static" \
       --extra-cflags="-I/usr/local/include -static" \
       --extra-ldflags="-L/usr/local/lib -static" \
diff --git a/ci-scripts/osx/tahoma-buildffmpeg.sh b/ci-scripts/osx/tahoma-buildffmpeg.sh
index e9dd7478..0b1eeaa9 100755
--- a/ci-scripts/osx/tahoma-buildffmpeg.sh
+++ b/ci-scripts/osx/tahoma-buildffmpeg.sh
@@ -26,8 +26,9 @@ cd ../..
 
 echo ">>> Cloning ffmpeg"
 git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg
+cp -R ffmpeg ffmpeg_shared
 
-cd ffmpeg
+cd ffmpeg_shared
 echo "*" >| .gitignore
 
 echo ">>> Configuring to build ffmpeg (shared)"
@@ -73,7 +74,8 @@ echo ">>> Installing ffmpeg (shared)"
 sudo make install
 
 echo ">>> Configuring to build ffmpeg (static)"
-make clean
+cd ../ffmpeg
+echo "*" >| .gitignore
 
 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
 export SDKROOT=`xcrun --show-sdk-path`