CMake Warning \(dev\) at Repeat.cmake:[0-9]+ \(export\): Policy CMP0103 is not set: Multiple export\(\) with same FILE without APPEND is not allowed. Run "cmake --help-policy CMP0103" for policy details. Use the cmake_policy command to set the policy and suppress this warning. export\(\) command already specified for the file foo.cmake Did you miss 'APPEND' keyword\? Call Stack \(most recent call first\): Repeat-CMP0103-WARN.cmake:[0-9]+ \(include\) CMakeLists.txt:[0-9]+ \(include\) This warning is for project developers. Use -Wno-dev to suppress it. CMake Warning \(dev\) at Repeat/CMakeLists.txt:[0-9]+ \(export\): Policy CMP0103 is not set: Multiple export\(\) with same FILE without APPEND is not allowed. Run "cmake --help-policy CMP0103" for policy details. Use the cmake_policy command to set the policy and suppress this warning. export\(\) command already specified for the file .+/foo.cmake Did you miss 'APPEND' keyword\? This warning is for project developers. Use -Wno-dev to suppress it.