CMake Error at test/CMakeLists.txt:20 (add_library)

[MausKaffee34767]

If i try to build epoll-shim:

git clone https://github.com/FreeBSDDesktop/epoll-shim.git
cd epoll-shim
mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo && cmake --build .

The cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo fails with:

CMake Error at test/CMakeLists.txt:20 (add_library):
  add_library cannot create target "epoll-shim" because another target with
  the same name already exists.  The existing target is a shared library
  created in source directory "/home/_____/epoll-shim/src".  See
  documentation for policy CMP0002 for more details.


-- Configuring incomplete, errors occurred!
See also "/home/_____/epoll-shim/build/CMakeFiles/CMakeOutput.log".
See also "/home/_____/epoll-shim/build/CMakeFiles/CMakeError.log".

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The system is: Linux - 6.5.0-26-generic - x86_64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /usr/bin/cc 
Build flags: 
Id flags:  

The output was:
0


Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

The C compiler identification is GNU, found in "/home/_____/epoll-shim/build/CMakeFiles/3.22.1/CompilerIdC/a.out"

Detecting C compiler ABI info compiled with the following output:
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[MausKaffee34767]

Note: another target with the same name already exists isn't correct. epoll-shim isn't installed on my pc.