nk@f3lix[±|master ✓]:~/Downloads/hpx/build $ cmake -DCMAKE_INSTALL_PREFIX=/home/nk/opt/hpx -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DHPX_WITH_MALLOC=system ..
-- The CXX compiler identification is unknown
-- The C compiler identification is unknown
-- Check for working CXX compiler: /usr/bin/clang++
-- Check for working CXX compiler: /usr/bin/clang++ -- broken
CMake Error at /usr/share/cmake-3.15/Modules/CMakeTestCXXCompiler.cmake:53 (message):
  The C++ compiler

    "/usr/bin/clang++"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /home/nk/Downloads/hpx/build/CMakeFiles/CMakeTmp

    Run Build Command(s):/usr/bin/make cmTC_9362c/fast && /usr/bin/make -f CMakeFiles/cmTC_9362c.dir/build.make CMakeFiles/cmTC_9362c.dir/build
    make[1]: Entering directory '/home/nk/Downloads/hpx/build/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_9362c.dir/testCXXCompiler.cxx.o
    /usr/bin/clang++     -o CMakeFiles/cmTC_9362c.dir/testCXXCompiler.cxx.o -c /home/nk/Downloads/hpx/build/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
    /usr/bin/clang++: error while loading shared libraries: libLLVM-9.so: cannot open shared object file: No such file or directory
    make[1]: *** [CMakeFiles/cmTC_9362c.dir/build.make:66: CMakeFiles/cmTC_9362c.dir/testCXXCompiler.cxx.o] Error 127
    make[1]: Leaving directory '/home/nk/Downloads/hpx/build/CMakeFiles/CMakeTmp'
    make: *** [Makefile:121: cmTC_9362c/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:47 (project)


-- Configuring incomplete, errors occurred!
See also "/home/nk/Downloads/hpx/build/CMakeFiles/CMakeOutput.log".
See also "/home/nk/Downloads/hpx/build/CMakeFiles/CMakeError.log".