-- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Failed
-- Looking for __atomic_fetch_add_4 in atomic
-- Looking for __atomic_fetch_add_4 in atomic - not found
CMake Error at cmake/modules/CheckAtomic.cmake:36 (message):
  Host compiler appears to require libatomic, but cannot find it.
Call Stack (most recent call first):
  cmake/config-ix.cmake:296 (include)
  CMakeLists.txt:408 (include)


-- Configuring incomplete, errors occurred!
See also 
"/home/flashgam/emsdk_portable/clang/tag-e1.36.0/build_tag-e1.36.0_32/CMakeFiles/CMakeOutput.log".
See also 
"/home/flashgam/emsdk_portable/clang/tag-e1.36.0/build_tag-e1.36.0_32/CMakeFiles/CMakeError.log".
CMake invocation failed due to exception!
Working directory: 
/home/flashgam/emsdk_portable/clang/tag-e1.36.0/build_tag-e1.36.0_32
Command '['cmake', '-G', 'Unix Makefiles', 
'-DCMAKE_BUILD_TYPE=RelWithDebInfo', '-DPYTHON_EXECUTABLE=/usr/bin/python', 
'-DLLVM_TARGETS_TO_BUILD=X86;JSBackend', '-DLLVM_INCLUDE_EXAMPLES=OFF', 
'-DCLANG_INCLUDE_EXAMPLES=OFF', '-DLLVM_INCLUDE_TESTS=OFF', 
'-DCLANG_INCLUDE_TESTS=OFF', 
'/home/flashgam/emsdk_portable/clang/tag-e1.36.0/src']' returned non-zero 
exit status 1
Installation failed!

This happened on 2 separate machines, running CentOS and libatomic is 
present and installed. What could be the problem?

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