|  | @@ -4,20 +4,20 @@ matrix:
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				|  |  |    fast_finish: true
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				|  |  |    include:
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				|  |  |    - os: linux
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				|  |  | -    dist: xenial
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				|  |  | +    dist: bionic
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				|  |  |      sudo: required
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				|  |  |      compiler: gcc
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				|  |  |      env: CERES_BUILD_TARGET=LINUX
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				|  |  |    - os: linux
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				|  |  | -    dist: xenial
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				|  |  | +    dist: bionic
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				|  |  |      sudo: required
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				|  |  |      compiler: gcc
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				|  |  |      env: CERES_BUILD_TARGET=ANDROID
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				|  |  |    - os: osx
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				|  |  | -    osx_image: xcode9.4
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				|  |  | +    osx_image: xcode11.2
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				|  |  |      env: CERES_BUILD_TARGET=OSX
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				|  |  |    - os: osx
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				|  |  | -    osx_image: xcode9.4
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				|  |  | +    osx_image: xcode11.2
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				|  |  |      env: CERES_BUILD_TARGET=IOS
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				|  |  |  
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				|  |  |  env:
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				|  | @@ -29,8 +29,8 @@ before_install:
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				|  |  |    - |
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				|  |  |      if [[ "$CERES_BUILD_TARGET" == "ANDROID" ]]; then
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				|  |  |        cd /tmp
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				|  |  | -      wget https://dl.google.com/android/repository/android-ndk-r17b-linux-x86_64.zip
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				|  |  | -      unzip -qq android-ndk-r17b-linux-x86_64.zip
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				|  |  | +      wget https://dl.google.com/android/repository/android-ndk-r20b-linux-x86_64.zip
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				|  |  | +      unzip -qq android-ndk-r20b-linux-x86_64.zip
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				|  |  |      fi
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				|  |  |  
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				|  |  |  install:
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				|  | @@ -49,7 +49,7 @@ script:
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				|  |  |      fi
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				|  |  |    - |
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				|  |  |      if [[ "$CERES_BUILD_TARGET" == "ANDROID" ]]; then
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				|  |  | -      cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/android-ndk-r17b/build/cmake/android.toolchain.cmake -DEIGEN_INCLUDE_DIR=/usr/local/include/eigen3 -DANDROID_ABI=armeabi-v7a -DANDROID_STL=c++_shared -DANDROID_NATIVE_API_LEVEL=android-24 -DMINIGLOG=ON -DBUILD_EXAMPLES=OFF $TRAVIS_BUILD_DIR
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				|  |  | +      cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/android-ndk-r20b/build/cmake/android.toolchain.cmake -DEIGEN_INCLUDE_DIR=/usr/include/eigen3 -DANDROID_ABI=arm64-v8a -DANDROID_STL=c++_shared -DANDROID_NATIVE_API_LEVEL=android-29 -DMINIGLOG=ON -DBUILD_EXAMPLES=OFF $TRAVIS_BUILD_DIR
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				|  |  |      fi
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				|  |  |    - |
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				|  |  |      if [[ "$CERES_BUILD_TARGET" == "IOS" ]]; then
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