title: AWS SDK C++ install using cmake on Ubuntu, problem with installing third-party libraries
body: <p>I am installing the <code>aws-cpp-sdk</code> in Ubuntu 20.04 by following the installation instructions on: <a href="https://github.com/aws/aws-sdk-cpp" rel="nofollow noreferrer">https://github.com/aws/aws-sdk-cpp</a></p>
  <p>I built/installed the SDK from source as per the instructions which worked. Installation locations:</p>
  <ul>
  <li>/usr/local/lib</li>
  <li>/usr/local/include/aws</li>
  </ul>
  <p>I built/installed the <code>aws-c-common</code> as per the instructions (although I didn't use a <code>DCMAKE_INSTALL_PREFIX</code>).</p>
  <p>I attempt to build <code>aws-checksums</code> but can't get past the cmake. When I run <code>cmake ..</code> while in the build directory which is in the code directory I get:</p>
  <pre><code>-- The C compiler identification is GNU 9.3.0
  -- Check for working C compiler: /usr/bin/cc
  -- Check for working C compiler: /usr/bin/cc -- works
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Detecting C compile features
  -- Detecting C compile features - done
  /usr/local/lib/cmake/lib/cmake
  CMake Error at CMakeLists.txt:32 (include):
    include could not find load file:
  
      AwsCFlags
  
  CMake Error at CMakeLists.txt:33 (include):
    include could not find load file:
  
      AwsCheckHeaders
  
  CMake Error at CMakeLists.txt:34 (include):
    include could not find load file:
  
      AwsSharedLibSetup
  
  CMake Error at CMakeLists.txt:35 (include):
    include could not find load file:
  
      AwsSanitizers
  
  CMake Error at CMakeLists.txt:37 (include):
    include could not find load file:
  
      AwsFindPackage
  
  CMake Error at CMakeLists.txt:38 (include):
    include could not find load file:
  
      AwsFeatureTests
  
  CMake Error at CMakeLists.txt:116 (aws_set_common_properties):
    Unknown CMake command &quot;aws_set_common_properties&quot;.
  
  -- Configuring incomplete, errors occurred!
  See also ...
  </code></pre>
  <p>I've tried to point the prefix to the sdk install folders but that did not solve my problem. That is where I get stuck. Any input is appreciated. Thank you.</p>